What Santorum is not telling you is that we have long had regulations on mercury emissions for other types of emission sources such as waste incinerators.

FORBES: The Hypocrisy And Stupidity Of The GOP's Hatred Of The EPA

Imagine a deal involving emission sources in China, which has some of the world's most polluting coal-fired power plants, and California, which is on a course to become one of the most stringently controlled states in carbon emissions.

CNN: Quicker fix for climate change

There are, however, no interference problems with field-emission X-ray sources, so these can be used to take high-resolution pictures while treatment is proceeding.

ECONOMIST: Modern X-ray technology

The EU package, which is under pressure because of fears of the cost of green energy in the middle of a global economic crisis, focuses on three areas: emission cuts, renewable energy sources and energy efficiencies.

BBC: No deal amid EU climate deadlock