"concentrations of greenhouse gases in the atmosphere are at their highest level in more than 200,000 years and climbing sharply." -- us president bill clinton, at un general assembly special session, june 1997 the president's quote reflects a growing concern about a global warming b natural disaster c illegal immigrants d disease epidemics

The correct answer is A.

The emissions of greenhouse gases, which are mostly generated by the combustion of fossil fuels (oil, coal and gas), used massively on industries throught the world, are the main cause of the global warming.

At the UN General Assembly in 1997, President Clinton aimed to create some degree of awareness about this situation with his speech, as it is a global problem that need to be approched jointly by all nations.

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