One letter to executives around the world has prioritized climate change on corporate agendas. But will this make a difference without government regulation?

In recent weeks, several of the largest and most profitable American companies have introduced elaborate plans to combat climate change. So why are they doing it now? And just how meaningful are their plans?

One letter to executives around the world has prioritized climate change on corporate agendas. But will this make a difference without government regulation?

In recent weeks, several of the largest and most profitable American companies have introduced elaborate plans to combat climate change. So why are they doing it now? And just how meaningful are their plans?