Hundreds of companies have set ambitious targets to reach net-zero carbon emissions by 2050. But what does i take to get there? And, more importantly, will it be enough to slow climate change? Environmental economics experts Oliver Miltenberger and Matthew D. Potts explain the challenges and opportunities.

More than 20% of the world’s largest corporations have set a 2050 target of going carbon neutral — but there’s a big difference between making a pledge and taking action. Here’s how to spot which companies are actually walking the walk.