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The European Union says that cars are responsible for 12% of CO2 emissions across the member states, but Davies says that figure is increasing as the car population grows, despite more fuel-efficient engines.
Road transport is cited by the Department for the Environment as the cause of 22% of Britains CO2 output.
The United Nations estimates that by 2025, 1.8 billion people will suffer acute water scarcity as a result of climate change, leading to mass starvation. Anything we can do to prevent that has to be worthwhile, Davies said.
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