Greta Thunberg won't be at this massive climate change summit, but Biden will be. What to know about COP27.

Greta Thunberg won't be at this massive climate change summit, but Biden will be. What to know about COP27. https://ift.tt/DMcv9Wk

More than 35,000 people from around the world are expected to be in Egypt at the COP27, the UN Climate Change Conference.