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Answer:

  1. There is 95 percent certainly that human activities are responsible for global warming.
  2. Carbon dioxide is at an "unprecedented" level not seen for the last 800,000 years.
  3. Sea level is set to continue to rise at a faster rate than over the past 40 years.
  4. Over the last two decades, the Greenland and Antarctic ice sheets have been melting and glaciers have receded in the most parts of the world.

Explanation: Smartness

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