WASHINGTON (AP) - As world leaders gather in Spain to discuss how to slow the warming of the planet, a spotlight falls on China - the top emitter of greenhouse gases.

China burns about half the coal used globally each year. Between 2000 and 2018, its annual carbon emissions nearly tripled, and it now accounts for about 30 per cent of the world's total. Yet it's also the leading market for solar panels, wind turbines and electric vehicles, and it manufactures abouttwo-thirds of solar cells installed worldwide.