In two weeks, US President Joe Biden will be hosting an online "climate summit" to mark Earth Day. He'll ask China and India to sign up to America's ambitious new plan to slow down climate change. Will they go for it? China is the world's largest polluter, but Beijing is rolling out solar and wind power as fast as it's burning coal. India, meanwhile, is loathe to pick up the slack for rich countries that polluted their way to wealth and now want everyone else to agree to emissions cuts. No matter what happens, any successful plan to reduce global emissions will require buy-in from these three nations which, along with the European Union, account for almost 60 percent of global carbon dioxide emissions nowadays. Here's a look at emissions by the world's top polluters compared to everyone else over the last two decades.