The earth heats and cools naturally, looking like a y=sin x or y=cos x graph if you were to correlate it. Some factors do increase of decrease the climate out of it's trend like CO2 emissions but it's nothing on a great scale. Our climate is self correcting.
We were worried about Global cooling 30 years ago and now it's Global Warming which is striking the media today. Of course, news stations won't tell you that because Global Warming is a hot topic which generates viewers on a global scale so it's can only mean higher ratings.
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