Global warming is being enhanced by the increased burning of fossil fuels since the start of the industrial revolution which was put increased amounts of greenhouse gases in our atmosphere. A large volcanic eruption can throw a lot of dust into our Earths air this acts as a shield to solar radiation and again causes a cooling trend into our atmosphere. Man-made causes are probably the most damaging cause. One of the causes is de-forestation; we breathe out CO2 and breathe in oxygen. The trees breathe in CO2 and breathe out oxygen. But people of Australia are burning trees so that now we are producing CO2 and we’re not replacing or replanting any plants. Pollution is the worst man-made problem because if visitors and people in our world destroy it by polluting it’s not going to be right.