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In Japan, for instance, an environmental engineer has attributed a mysterious pestilence that is killing trees on Yakushima Island to pollutants from China.

But the proportion of China’s exports that are made in China has risen steadily in recent years as many companies move more of their supply chains, instead of just having final assembly work done here.

It has also delayed new energy investments and is planning to close almost a quarter of its fossil fuel power plants,

European energy companies, struggling to respond to weak demand in a flatlining economy, say they need guaranteed pricing to keep open unprofitable plants or to invest in new ones.

Their revenue is being hit by dwindling demand for electricity and by new wind and solar projects that undercut the price of the energy produced from many fossil fuel plants.

At the same time, record-low prices on carbon emissions trading markets, which were introduced to encourage clean and efficient energy production and use, have perversely become a disincentive to investment.

Many of the Continent’s aging power stations, particularly those that burn highly polluting coal, are earmarked for closure by 2020 to meet stringent local environment regulations.

Without these investments, industrial companies in Europe may face higher energy prices when local economies eventually recover,

“Energy utilities are facing a perfect storm,”

In a bid to generate 20 percent of the European Union’s electricity from renewable sources by 2020, Germany, Spain and other E.U. countries have provided hefty subsidies to wind and solar farms, which now constitute a sizable minority of daily electricity generation, often surpassing the 20 percent target.

Policy makers are debating a system of support payments to keep uneconomic power plants open,

“Without long-term signals of energy prices, investment won’t happen.”

Some analysts also expect domestic regulators to eventually create financial incentives for companies

Meanwhile, the share of coal – the dirtiest fuel – has been rising, not falling, in the rest of the world’s energy mix.

Put differently, if the world continues to build coal-fired power plants at the current rate, those plants will still be around in 2050, regardless of what other technologies become viable in the meantime.

Even a serious fracking mishap would be unlikely to cause as much damage as the Deepwater Horizon oil spill in 2010, the Fukushima nuclear catastrophe in 2011, or coal-mining tragedies that play out dramatically in frequent explosions and collapses (and more insidiously in the form of lung disease, water pollution, and soil erosion).

“There has been a significant reduction in demand over four or five years, and we don’t see robust demand in the future.”

Several researchers told me that the current towel-snapping between Beijing and Tokyo over islands in the East China Sea is due less to nationalistic posturing than to nearby petroleum deposits.)

Today, a fifth of U.S. energy consumption is fueled by coal, mainly from Appalachia and the West, a long-term energy source that has provided jobs for millions, a century-old way of life

Roughly speaking, burning coal produces twice as much carbon dioxide as burning the equivalent amount of natural gas. Almost all domestic coal is used to generate electricity—it produces 38 percent of the U.S. power supply. Fracking is swiftly changing this: in 2011, utilities reported plans to shut down 57 of the nation’s 1,287 coal-fired generators the following year. Largely in consequence, U.S. energy-related carbon-dioxide emissions have dropped to figures last seen in 1995. Since 2006, they have fallen more than those from any other nation in the world.

In the sort of development that irresistibly attracts descriptors like ironic, Germany, often touted as an environmental model for its commitment to solar and wind power, has expanded its use of coal, and as a result is steadily increasing its carbon-dioxide output. Unlike Americans, Europeans can’t readily switch to natural gas; Continental nations, which import most of their natural gas, agreed to long-term contracts that tie its price to the price of oil, now quite high.

What is known, says Timothy Collett, the energy-research director for the USGS program, is that some of the gulf’s more than 3,500 oil and gas wells are in gas-hydrate areas.

In Dutch-disease scenarios, oil weakens all the pillars but one—the petroleum industry, which bloats steroidally.

Because the national petroleum company, with its gush of oil revenues, is the center of national economic power, “the ruler typically puts a loyalist in charge,” says Michael Ross, a UCLA political scientist and the author of The Oil Curse (2012). “The possibilities for corruption are endless.” Governments dip into the oil kitty to reward friends and buy off enemies. Sometimes the money goes to simple bribes; in the early 1990s, hundreds of millions of euros from France’s state oil company, Elf Aquitaine, lined the pockets of businessmen and politicians at home and abroad.

“How will the royal family contain both the mullahs and the unemployed youth without a slush fund?”

It seems fair to say that if autocrats in these places were toppled, most Americans would not mourn. But it seems equally fair to say that they would not necessarily be enthusiastic about their replacements.

ED bulbs are also more durable, lasting 10 times as long as a fluorescent bulb and 100 times as long as an incandescent bulb.

In 2006 he was awarded the Millennium Technology Prize of one million euros (about $1.3 million) for inventing the first efficient blue-light laser, opening the way for things like Blu-ray players.

The country accounts for over a quarter of global greenhouse gas emissions.

Even assuming that China’s population does not grow at all over the next 30 years, that the energy efficiency of its economy increases at a faster pace than most developed and developing countries and that it manages to decarbonize its energy sources faster than pretty much anybody else, China would still be emitting a lot more carbon in 2040 than it does today, according to E.I.A. calculations.

Can the United States or anybody else do anything to speed China down a low-carbon path?

The latest report from the United Nations Intergovernmental Panel on Climate Change, issued in April, suggested several ways to allot responsibilities. If one starts counting in the 18th century and counts only emissions from industry and energy generation, the United States is responsible for more than a quarter of all greenhouse gases that humanity has put into the air. China, by contrast, is responsible for 10 percent.But if one starts counting in 1990, when the world first became aware that CO2 was a problem, and includes greenhouse gases emitted from changes in land use, the United States is responsible for only 18 percent, and China’s share rises to 15 percent. Rich and poor countries, unsurprisingly, disagree on the proper measure. Photo

Not everybody will meet their Copenhagen pledges. Japan, which unplugged its nuclear energy after the disaster at the Fukushima nuclear power plant, will fall behind. So will Canada and Australia, whose new conservative governments have lost interest in the pledges of their predecessors.

The methane is like a hangover that you can get over if you stop drinking,” said Raymond T. Pierrehumbert, a climate scientist at the University of Chicago and the author of a textbook on planetary atmospheres. “CO2 is more like lead poisoning — it sticks around, you don’t get rid of it, and it causes irreversible harm.”

Aggressively controlling methane, they say, would help slow the warming sharply over the coming decades.

By contrast, “our success in controlling CO2 emissions is likely to make very little difference on temperature over the next 40 years,” said Drew Shindell, a longtime NASA climate scientist who is leaving for Duke University.

Experts say that, looking at the more distant future, it is hugely important to keep carbon dioxide out of the atmosphere now, even if that requires burning more gas. Dr. Pierrehumbert and Dr. Shindell largely agree on this point, with Dr. Pierrehumbert discounting the gas-is-worse-than-coal argument as “bunkum.”

American, European and Chinese regulators have put in effect energy-efficiency rules that phase out the use of incandescent bulbs. Big multinationals that make light bulbs like Philips, Osram and General Electric have responded by embracing light-emitting diodes, which use one-fifth of the electricity of incandescent bulbs and half the electricity of fluorescent bulbs.

Many Chinese producers also have a poor and worsening reputation for quality, which may hurt them in the long term.

The industry, for instance, is highly segmented.

Lighting accounts for about 6 percent of the world’s emissions of greenhouse gases, and LEDs have the potential to steeply reduce them.

Prices have fallen by nearly half in the last year for low-end, low-wattage LEDs made in China, and by 15 to 20 percent for the higher-wattage versions made elsewhere, buyers and manufacturing executives said.

“We do not buy Chinese LEDs,” said Mike Pugh, the procurement director at Xicato in San Jose, Calif., a large provider of indoor lighting systems for retailers and hotels. “We just can’t take that chance.”

Xicato instead buys LEDs from multinationals like Cree of Durham, N.C.; Philips Lumileds, based in San Jose, Calif.; and Osram Opto Semiconductors of Regensburg, Germany.

Three-quarters of China’s electricity still comes from burning coal, which contributes to severe air pollution as well as global warming.

She earns $500 a month plus medical benefits and free food and lodging in an air-conditioned dormitory where employees sleep four to six i

the solar and LED industries in China received huge loans at low interest rates from state-owned banks following directives from Beijing

“We have been paying US$100,000 in annual taxes directly to the Kindia prefecture,” he told IRIN. “The distribution of the money rests with them according to the needs they have identified in Mambia.”

Seeing this for themselves, the CBK became concerned that the money was not being well spent, according to Cirra Dieng, communications officer at the CBK, and withdrew its payments in 2007 awaiting some explanation. They are still waiting.

The EITI has set up a monitoring committee made up of government representatives, mining companies and civil society to push mining companies to publish what they pay and the government to disclose what it receives at the state, prefecture and CRD level. So far it has done so for six mining companies, including the CBK.