World history homework help

As an idea, globalism seems to be the opposite of nationalism. Yet both seem to co-exist in the same world and sometimes in the same minds. How is this possible?
Most of us would agree that rapid population growth and unrestrained exploitation of the planet’s resources are leading us all to global disaster. Yet we also feel that the number of children we have and the kinds of cars we drive are not anyone’s business but our own. How is it possible to address this kind of conflict?
Colonial powers like Britain and France may no longer exert direct power over Africa and Asia, but imperialism is still a powerful force. What influences do Western ideas and products have on the “Third World”?
How can economic development help to resolve the problems implicit in unrestrained population growth?
Few issues are as economically and politically complex as global warming. What approach would you recommend to preventing or addressing the problems that will likely result from a warming planet?