1.
In the past 200 years
[ঢাবিঃ গ ইউনিট (ব্যবসায় শিক্ষা) ২০১৮-২০১৯ : 2019]
1. The earth has seen an Ice Age, warming and everything in between
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2. The earth has become very hot like a greenhouse
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3. The earth has become a warmer place
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4. Fossil fuels have been used for making greenhouses
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