Antonio Guterres says 900 million people living in low-lying regions, including small islands and major coastal cities, may become climate refugees if global warming ignored

Scientists say hypothetical barrier in orbit could temper climate change; skeptics call proposal a distraction

Scientists say rings of juniper wood from 3,000 years ago showed three-straight years with low growth, suggesting a prolonged and severe drought

Electreon passes pre-screening for tender to build Sweden's first electric road along 42 kilometers, the longest stretch in the world

Experts compare ice cores taken in 1995 and 2011, finding alarming spike in temperatures; lead author of study says findings are 'clear signature of global warming'

Swedish campaigner supporting protests against demolition of village, in symbol of resistance against fossil fuels

Sultan al-Jaber, a veteran technocrat who also oversees emirate's renewable energy efforts, seen as controversial choice given his role in implementing plan to boost oil production

While no roads have melted, as they did during last year's heatwave in the UK, National Roads Company is seeking more climate-resistant materials, a green road-building standard

Envoys at COP15 Biodiversity Conference commit to protect 30% of environment vital for biodiversity by 2030, boost support for poorer countries by tens of millions of dollars

Chinese chair of conference 'confident' global pact to protect biodiversity will be inked; Canadian envoy surprised over steps toward agreement