Future historians may look back on 2015 as the year that the renewable energy ascendancy began.
Here's the real story behind the oil price collapse.
Oil giants are now trying to present themselves as poverty fighters and defenders of human wellbeing.
The Republican energy agenda goes far beyond Keystone.
In the '80s, Big Tobacco targeted the developing world, where cigarette demand was strong and regulation was weak. Now, energy companies are taking a page from their playbook.
Oil giants claim there are no limits on the future of oil and gas extraction, but they may be in for a surprise or two down the road.
Mass protests over green space in Turkey posed a significant threat to the ruling party, and other countries have begun to feel the heat as well.
Investment in unconventional fossil fuels is expected to outpace spending on renewables by a ratio of at least 3-to-1 in the decades ahead.
Every now and then what a president decides actually determines how the world turns.