There are two numbers you need to know about climate change:

The first is 51 billion and the second is 0. 

51 billion is how many tons of greenhouse gases the world typically adds into the atmosphere every year. Although the figure goes up or down year to year, this is where we are today. Zero, is what we need to aim for. To stop warming and avoid the worst effects of climate change. 

It sounds difficult, because it will be. The world has never done anything quite as big. Every country will need to change how they engage in every activity in modern life – because growing things, industry activities, travelling around places involve greenhouse gases release.

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