A problem with fossil fuels is the pollution and global warming gases they produce.

And in turn using energy to make the hydrogen will inevitably produce unwanted global warming gases.

But he ignores emissions of carbon dioxide, the main global warming gas.

The result has been ever-increasing emissions of global warming gases and more dependence on foreign oil.

The process by which nuclear power is generated creates large quantities of global warming gases.

It would also make a big dent in America's emissions of global warming gases.

One was to regulate emissions of carbon dioxide, the main global warming gas.

Transport is the fastest-growing source of global warming gases in Europe.

To some extent, there is a balance between old, traditional pollutants and the new concern of global warming gases.

A huge potential supply of global warming gas is being released from what should be a wonderful area.