A recent slowdown in the rise of the Earth’s surface temperatures has led some commentators to question whether scientists have exaggerated the global warming problem.

Scientific advances have removed any reasonable doubt that carbon emissions are warming the planet, especially since 1970. Most scientists agree that natural cycles of the sun and oceans explain some variation in temperatures, but they cannot explain much of the 0.7 degree Celsius warming since the beginning of the 20th century.

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