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It’s working and it looks normal. We are thrilled, but we don’t know what tomorrow will bring us. This has never been done before

Last year, some 41,354 Americans received a transplanted organ, more than half of them receiving kidneys,

But there is an acute shortage of organs, and about a dozen people on the lists die each day. Some 3,817 Americans received human donor hearts last year as replacements, more than ever before, but the potential demand is still higher.

Researchers hope procedures like this will usher in a new era in medicine in the future when replacement organs are no longer in short supply for the more than half a million Americans who are waiting for kidneys and other organs.

He is also being monitored for infections, including porcine retrovirus, a pig virus that may be transmitted to humans, although the risk is considered low.

But he added that there were many hurdles to overcome before such a procedure could be broadly applied, noting that rejection of organs occurs even when a well-matched human donor kidney is transplanted.

It takes a long time to mature a therapy like this.”

Mr. Bennett decided to gamble on the experimental treatment because he would have died without a new heart, had exhausted other treatments and was too sick to qualify for a human donor heart, family members and doctors said.

Mr. Bennett is still connected to a heart-lung bypass machine, which was keeping him alive before the operation, but that is not unusual for a new heart transplant recipient, experts said.

The new heart is functioning and already doing most of the work, and his doctors said he could be taken off the machine on Tuesday. Mr. Bennett is being closely monitored for signs that his body is rejecting the new organ, but the first 48 hours, which are critical, passed without incident.

It is the first successful transplant of a pig’s heart into a human being. The eight-hour operation took place in Baltimore on Friday, and the patient, David Bennett Sr. of Maryland, was doing well on Monday, according to surgeons at the University of Maryland Medical Center.

Xenotransplantation, the process of grafting or transplanting organs or tissues from animals to humans, has a long history. Efforts to use the blood and skin of animals go back hundreds of years.

In the 1960s, chimpanzee kidneys were transplanted into some human patients, but the longest a recipient lived was nine months.

In 1983, a baboon heart was transplanted into an infant known as Baby Fae, but she died 20 days later.

Two newer technologies — gene editing and cloning — have yielded genetically altered pig organs less likely to be rejected by humans.

the time to carry out better screening for infectious diseases, and the possibility of a new organ at the time that the patient needs it.

The heart transplanted into Mr. Bennett came from a genetically altered pig provided by Revivicor, a regenerative medicine company based in Blacksburg, Va.

The pig had 10 genetic modifications. Four genes were knocked out, or inactivated, including one that encodes a molecule that causes an aggressive human rejection response.

A growth gene was also inactivated to prevent the pig’s heart from continuing to grow after it was implanted,

In addition, six human genes were inserted into the genome of the donor pig — modifications designed to make the porcine organs more tolerable to the human immune system.

The team used a new experimental drug developed in part by Dr. Mohiuddin and made by Kiniksa Pharmaceuticals to suppress the immune system and prevent rejection.

“The anatomy was a little squirrelly, and we had a few moments of ‘uh-oh’ and had to do some clever plastic surgery to make everything fit,”

“the heart fired right up” and “the animal heart began to squeeze.”

He said his father had had a pig’s valve inserted about a decade ago, and he thought his father might be confused. But after a while, Mr. Bennett said, “I realized, ‘Man, he is telling the truth and not going crazy. And he could be the first ever.’”

“It’s a project for a generation; it’s going to take till 2040 or 2050, and it’s hard,” said Gerd Rosenkranz, a former journalist at Der Spiegel who’s now an analyst at Agora Energiewende, a Berlin think tank. “It’s making electricity more expensive for individual consumers. And still, if you ask people in a poll, Do you want the energiewende? then 90 percent say yes.”

The Germans have an origin myth: It says they came from the dark and impenetrable heart of the forest

. The forest became the place where Germans go to restore their souls—a habit that predisposed them to care about the environment.

So in the late 1970s, when fossil fuel emissions were blamed for killing German forests with acid rain, the outrage was nationwide. The oil embargo of 1973 had already made Germans, who have very little oil and gas of their own, think about energy. The threat ofwaldsterben, or forest death, made them think harder.

I came away thinking there would have been no energiewende at all without antinuclear sentiment—the fear of meltdown is a much more powerful and immediate motive than the fear of slowly rising temperatures and seas.

energy researcher Volker Quaschning put it this way: “Nuclear power affects me personally. Climate change affects my kids. That’s the difference.”

NG STAFF; EVAN APP

Demonstrators in the 1970s and ’80s were protesting not just nuclear reactors but plans to deploy American nuclear missiles in West Germany. The two didn’t seem separable. When the German Green Party was founded in 1980, pacifism and opposition to nuclear power were both central tenets.

Chernobyl was a watershed.

The environmental movement’s biggest mistake has been to say, ‘Do less. Tighten your belts. Consume less,’ ” Fell said. “People associate that with a lower quality of life. ‘Do things differently, with cheap, renewable electricity’—that’s the message.”

It was 1990, the year Germany was officially reunified—and while the country was preoccupied with that monumental task, a bill boosting the energiewende made its way through the Bundestag without much public notice. Just two pages long, it enshrined a crucial principle: Producers of renewable electricity had the right to feed into the grid, and utilities had to pay them a “feed-in tariff.” Wind turbines began to sprout in the windy north.

The biogas, the solar panels that cover many roofs, and especially the wind turbines allow Wildpoldsried to produce nearly five times as much electricity as it consumes.

In a recent essay William Nordhaus, a Yale economist who has spent decades studying the problem of addressing climate change, identified what he considers its essence: free riders. Because it’s a global problem, and doing something is costly, every country has an incentive to do nothing and hope that others will act. While most countries have been free riders, Germany has behaved differently: It has ridden out ahead. And in so doing, it has made the journey easier for the rest of us.

Fell’s law, then, helped drive down the cost of solar and wind, making them competitive in many regions with fossil fuels. One sign of that: Germany’s tariff for large new solar facilities has fallen from 50 euro cents a kilowatt-hour to less than 10. “We’ve created a completely new situation in 15 years

Germans paid for this success not through taxes but through a renewable-energy surcharge on their electricity bills. This year the surcharge is 6.17 euro cents per kilowatt-hour, which for the average customer amounts to about 18 euros a month—a hardship for some

The German economy as a whole devotes about as much of its gross national product to electricity as it did in 1991.

Ideally, to reduce emissions, Germany should replace lignite with gas. But as renewables have flooded the grid, something else has happened: On the wholesale market where contracts to deliver electricity are bought and sold, the price of electricity has plummeted, such that gas-fired power plants and sometimes even plants burning hard coal are priced out of the market.

Old lignite-fired power plants are rattling along at full steam, 24/7, while modern gas-fired plants with half the emissions are standing idle.

“Of course we have to find a track to get rid of our coal—it’s very obvious,” said Jochen Flasbarth, state secretary in the environment ministry. “But it’s quite difficult. We are not a very resource-rich country, and the one resource we have is lignite.”

Vattenfall formally inaugurated its first German North Sea wind park, an 80-turbine project called DanTysk that lies some 50 miles offshore. The ceremony in a Hamburg ballroom was a happy occasion for the city of Munich too. Its municipal utility, Stadtwerke München, owns 49 percent of the project. As a result Munich now produces enough renewable electricity to supply its households, subway, and tram lines. By 2025 it plans to meet all of its demand with renewables.

Last spring Gabriel proposed a special emissions levy on old, inefficient coal plants; he soon had 15,000 miners and power plant workers, encouraged by their employers, demonstrating outside his ministry. In July the government backed down. Instead of taxing the utilities, it said it would pay them to shut down a few coal plants—achieving only half the planned emissions savings. For the energiewende to succeed, Germany will have to do much more.

The government’s goal is to have a million electric cars on the road by 2020; so far there are about 40,000. The basic problem is that the cars are still too expensive for most Germans, and the government hasn’t offered serious incentives to buy them—it hasn’t done for transportation what Fell’s law did for electricity.

“The strategy has always been to modernize old buildings in such a way that they use almost no energy and cover what they do use with renewables,” said Matthias Sandrock, a researcher at the Hamburg Institute. “That’s the strategy, but it’s not working. A lot is being done, but not enough.”

All over Germany, old buildings are being wrapped in six inches of foam insulation and refitted with modern windows. Low-interest loans from the bank that helped rebuild the war-torn west with Marshall Plan funds pay for many projects. Just one percent of the stock is being renovated every year, though

For all buildings to be nearly climate neutral by 2050—the official goal—the rate would need to double at least.

here’s the thing about the Germans: They knew the energiewende was never going to be a walk in the forest, and yet they set out on it. What can we learn from them? We can’t transplant their desire to reject nuclear power. We can’t appropriate their experience of two great nation-changing projects—rebuilding their country when it seemed impossible, 70 years ago, and reunifying their country when it seemed forever divided, 25 years ago. But we can be inspired to think that the energiewende might be possible for other countries too.

At the peak of the boom, in 2012, 7.6 gigawatts of PV panels were installed in Germany in a single year—the equivalent, when the sun is shining, of seven nuclear plants. A German solar-panel industry blossomed, until it was undercut by lower-cost manufacturers in China—which took the boom worldwide

Curtailing its use is made harder by the fact that Germany’s big utilities have been losing money lately—because of the energiewende, they say; because of their failure to adapt to the energiewende, say their critics. E.ON, the largest utility, which owns Grafenrheinfeld and many other plants, declared a loss of more than three billion euros last year.

“The utilities in Germany had one strategy,” Flasbarth said, “and that was to defend their track—nuclear plus fossil. They didn’t have a strategy B.”

In a conference room, Olaf Adermann, asset manager for Vattenfall’s lignite operations, explained that Vattenfall and other utilities had never expected renewables to take off so fast. Even with the looming shutdown of more nuclear reactors, Germany has too much generating capacity.