What to know about COP27 as the U.N. climate summit convenes in Egypt

London — The scientific community and the majority of the world's political leaders agree that climate change is one of the biggest threats to life on this planet, and the impacts are already being seen and felt around the world in the form of droughts, more frequent and more severe storms, rampant flooding, heat waves and wildfires. 

While there's little doubt that the problem can only be addressed through international cooperation, it can be hard to keep track of global efforts to do that. Every year there is one major global event that seeks to put it all in one place. 

Below is a breakdown of what to expect from the biggest international climate conference, COP27, as it kicks off Sunday in Egypt.