Shale gas fracking has helped US carbon emissions to fall. But American carbon extraction is still rising, undermining progress and increasing emissions overseas.
As the Keystone XL pipeline has been mired in controversy, a competitor is speeding through plans for a pipeline that would do the exact same thing.
Scientists wade into the fray.
Charts: Without subsidies, Elon Musk’s electric-car startup wouldn’t have rolled this far.
Five years in, BC’s carbon tax has successfully reduced greenhouse gas emissions in a stable economy.