GREENHOUSE EFFECT i believe is the the biggest impact. It often gets a bad rap because of its association with global warming, but the reality is we couldn't live without it. Life on earth depends on energy from the sun. There is about 30% of sunlight that beams toward earth is deflected by the outer atmosphere and scattered back in to space. But the rest reaches the planet's surface and is reflected upward again as a type of slow-moving energy called infrared radiation. Problems begin when human activities distort and accelerate the natural process by creating more greenhouse gases in the atmosphere then are necessary to warm our planet to a likely temperature.
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