We couldn't live without CO2 in the air, but too much of it is dangerous. What is CO2, where does it come from and what are the biggest CO2 emitters?
With much electricity already coming from renewable energy, there is great potential for e-mobility in Kenya. But tackling air pollution through sustainable transport solutions has its challenges too.
Even the world's largest CO2 emitters are suffering the effects of climate change. So what's stopping countries like Germany, India, Saudi Arabia, the US and China from changing tack and going green?
Over 30 mayors from across the globe have pledged to deliver clean air for the 140 million people living in their cities. Delivering clean air on such a scale will take both ambitious targets and concrete action.
Diesel generators are often dirty devices. But what if you could turn the soot they puff out into something useful? A young group of engineers in Delhi did just that. And ships are next.
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