Here is my discussion, it doesn’t have to be a lot, One page is enough. Easy words are preferred.
The United States constitutes 4% of the world population, yet has the largest economy and military. China and India combined represent almost 40% of the global population. Altogether, we have over 7 billion people stressing the earth’s resources and carrying capacity. Do you think we can tackle environmental problems such as climate change on our own, help generate more environmentally-friendly technology, or should we just continue to live our lives and not worry? Do you think we will see more conflicts over resources–oil and water, for example?