Global warming is the rise of the surface’s average temperature of the planet. There are many natural and human causes to this that modern society would see as normal.
Evidence to support the natural causes of global warming would be volcanic eruptions. When a volcano erupts, a series of materials and chemicals would be realised and eventually contributes to global warming. It also blocks out the sunlight, which is Earths major source of light and warmth; this leads to the climate to change. Good, but you need to look back as well. The strongest evidence of natural climate change is that it happened before the world’s population increased. You need to mention the tree rings and ice cores that prove temperature changes happened over thousands of years.
Evidence to support the human causes of global warming would be Enhanced greenhouse gas emissions. The greenhouse effect is natural and is essential as it keeps the planet warm, however humans increase the warmth by using carbon dioxide for car fuel and breeding cows that realises methane. This then causes energy to build up and becomes trapped in the atmosphere, making the planet’s temperature to increase unhealthily. The evidence for this is the extreme way in which the temperatures have increased in the last hundred years or so. They have increased far more than any time in the past.
To conclude, the natural cause to global warming would be volcanic eruptions, and the human cause would be enhancing the greenhouse gas emissions. You’ve explained the causes very well, but the question asks for the evidence too. Without mentioning this you’d be limited to a low level 2. You’d still probably get about 5/10 though.
PS. TEACHERS COMMENTS IN BOLD.
React!