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Sixteen prominent climate scientists argue that there is more reason than ever for the Environmental Protection Agency to regulate greenhouse gases, at the same time some politicians are pushing the EPA to reverse its 2009 decision to do so.

Bacteria, which are vital for the health of all animals, also played a major role in the evolution of animals and their tissues.

Heat trapped by greenhouse gases is raising ocean temperatures faster than previously thought, concludes an analysis of four recent ocean-heating observations.

While most developed countries have reduced the construction of large dams for the production of electricity in recent decades, developing countries, including Brazil, have embarked on even more massive hydropower developments.

Rising among fir and spruce on the Canadian Shield, the Ottawa River flows through forests and wetlands and alongside bucolic orchards and farms.