The biggest climate stories of 2015

From the 195-nation agreement in Paris to curb global warming, to a journey down the Mekong River, evidence that climate change is impacting livelihoods and political decisions is stronger than ever

2015 has been a big year for climate change. The year has witnessed dizzying highs and stunning lows, from the hottest January on record, to March, when global carbon dioxide levels hit a million-year high, to December, when nearly 200 nations signed an agreement to minimize global warming. Here are seven stories that give a good snapshot of the political, economic and scientific milestones that changed the way we view - and the way we deal with - global warming.