As carbon emissions change the chemistry of the seas, ocean acidification threatens marine life and human livelihoods. How worried should you be about climate change’s so-called “evil twin”?

This video explains how carbon markets use cap and trade systems to limit emissions, create economic incentives for polluters to reduce their carbon output, and support a more efficient transition to clean energy.

Thereare some questions that keep even billionaire philanthropist and entrepreneur Bill Gates up at night. Will there be another pandemic? Are global tensions going to reach a boiling point, sparking a global war? What would push us to that precipice?