What are the main threats of climate change? The rate of carbon emissions are the highest they’ve been in 66 million years and the amount of warming in the coming decades is expected to be 250 times greater than the average warming during the past century. However, the rises in temperature and carbon dioxide levels we’ve seen in the past century are extreme and are accelerating. Over Earth’s history, carbon dioxide levels fluctuate due to volcanic activity or the carbon cycle (animals and bacteria breathe in oxygen and breathe out carbon dioxide while plants do the opposite). The more carbon dioxide in the atmosphere, the warmer it gets. Scientists have known for centuries that gases in Earth’s atmosphere like carbon dioxide and methane act as a greenhouse, preventing a certain amount of heat radiation from escaping back to space. Humanity’s accelerated burning of fossil fuels and deforestation ( forests are key parts of the planet’s natural carbon management systems) have led to rapid increases of greenhouse gases in the atmosphere and global warming. Yes, over 97% of scientist agree that humans cause climate change.
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