While there are many natural causes of global warming, these causes do not account for the extra warming we are currently seeing on our planet. The current warming is anthropogenic, created by humans.
How do humans cause global warming? We are accelerating the natural climatological cycles with our human-created emissions of greenhouse gases. The primary gas, carbon dioxide, is released every time you use fossil fuels- currently our main energy source. Unless you help stop those emissions, there is little hope of a secure future for humans.
You'll see that dangerous shifts in the Earth's climate are happening as we speak due to human induced global warming, and as it continues the consequences will worsen. Furthermore, such changes may be self-reinforcing. From an objective perspective, it looks like we are playing Russian roulette with all of life on Earth!
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