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Where are you from, weingburgerd? Find out if there is an issue within your community regarding some policy effecting carbon emissions and choose a side. It could be a local power plant, water pumping, infrastructure project, community gardening, or traffic congestion to name just a few. Keep your focus narrow because global warming is a broad subject.
Alternatively you could explore some alternate energy source and look at how it compares to current energy sources, in terms of global emissions. You could also look at how much it will cost in terms of infrastructure, and how feasible it is. ie advantages and disadvantages.
Another idea could be to look at what the effects of global warming might be in a certain amount of time and how you/ your community / your country might go about decreasing global warming through your own actions.