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For years, clean energy advocates have pointed towards hydroelectricity as an important alternative to gas, coal and nuclear power plants. But a new study suggests that the dams and reservoirs commonly associated with this clean energy source are actually pumping a significant amount of carbon emission into the air.

Brazil's conservative National Congress has rushed to pass a wave of legislative initiatives, which taken all together, would dismantle much of the nation's body of law protecting the environment and indigenous people - an effort likely to escalate in 2017. The latest attempt occurred last week, just before the parliamentary recess. The agricultural lobby unexpectedly put forward three bills, known as Decretos Legislativos (PDCs), which are laws promulgated by the President of the Senate over which the country's President does not have the right of veto. If eventually passed, as seems likely, the bills will allow industrial waterways (requiring many dozens of new dams) to be built without the proper assessment of environmental and social impacts. The waterways would be used by agribusiness as a cheap means of exporting soy and other commodities.

A Brazilian Senate Commission is quickly, and surreptitiously, moving forward a constitutional amendment (PEC 65) that would end the need for environmental assessment approvals for public works projects in Brazil ranging from Amazon dams to roads and canals, and oil infrastructure.

The proposed Pebble Mine in southwestern Alaska is a project of almost unfathomable scale. The Pebble Limited Partnership intends to excavate a thick layer of ore - nearly a mile deep in places - containing an estimated 81 billion pounds of copper, 5.6 billion pounds of molybdenum, and 107 million ounces of gold. The mine would cover 28 square miles and require the construction of the world's largest earthen dam - 700 feet high and several miles long - to hold back a 10-square-mile containment pond filled with up to 2.5 billion tons of sulfide-laden mine waste. All this would be built not only in an active seismic region, but also in one of the most unspoiled and breathtaking places on the planet - the headwaters of Bristol Bay, home to the world's most productive salmon fishery. Composed of tundra plain, mountain ranges, hundreds of rivers, and thousands of lakes, the greater Bristol Bay region encompasses five national parks and wildlife refuges, and one of the largest state parks in the U.S.

SaskPower began full operation of its flagship carbon capture and storage project at the Boundary Dam power plant in Saskatchewan yesterday, making it the world's first commercial scale carbon capture and storage facility at a coal-fired power plant.