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Methane, the main component of natural gas, is a much more potent warming pollutant than carbon dioxide
The big idea of companies trading rights to emit greenhouse gases has floundered in Europe.
Making an energy pledge is one thing, following through is a whole different story
A look at the ecosystem of the Mekong Delta.
Countries where millions live without electricity say they must emit more carbon.
Entrepreneurs and governments have pledged billions for low-carbon technology.
President Obama went way over his time limit but didn't seem to care.
Pope Francis is visiting Kenya, Uganda and the Central African Republic.
Some environmentalists question Britain's claim to be a leader on climate change.
In Paris, representatives of some 200 countries will work towards a climate change deal.
