"Compared with eye-catching renewable power technologies like wind turbines and solar panels, energy efficiency is nearly invisible. But advocates say doing more with less power may be an even more critical weapon in the fight against climate change and offers big economic benefits, too."

"A growing body of evidence found an array of flame-retardant chemicals – many which are carcinogenic – in test participants, a potential health concern for firefighters and others exposed to the chemicals."

"A Spanish pledge of 120 million euros ($150 million) to a fund to help poor nations cope with global warming has raised the total close to the $10 billion U.N. target before a U.N. meeting in Peru next week to work on a climate deal."

"Russia's ruble hit a new all-time low on Monday, dropping about 5 percent as declining oil prices and the conflict in eastern Ukraine weigh on the country's economic prospects."