This weekend, something truly amazing happened. In more than 30 countries, and as many as 160 cities, more than 20,000 people took to the streets to make a strong and diverse call to save the Arctic, celebrating the top of our world...

Yesterday, over half a million people in 160 countries across the world marched against climate change. What clearer signal can there be to policy leaders that they need to either lead or get out of the way? Leading means using...

On Sunday, something incredible happened. I got on my bike, I cycled around Washington DC and 14,000 people came with me, in over 106 cities, in 36 countries, in every continent around the world. I joined the biggest demonstration ever...