Have you seen the starving children in Africa? Or people in poor countries that do not have clean water? The world's population is growing so rapidly that it is predicted we will run out of resource in only a few decades!
We should also find alternatives. Fossil fuels are running low, and are polluting our air. No fuel means nothing to run cars on, nothing to run heating and air conditioning on, and no electricity.We should try to switch to better alternatives such as solar, the wind, or hydro power, use bio-fuels, and recycle our waste products more efficiently. These different methods would supply us with fuel in a way that is much better for the environment. If we do not do this soon animals will die, deforestation will increase, and all of our resources will begin to decrease. Plants let out oxygen, without them we will no be able to breath. Humans are spread across the globe, but there are many places we have not inhabited because the conditions are too harsh. Antarctica and parts of Australia are examples of places we have not settled in. If we keep this yearly population expansion, and do not change our ways, generations to come will have a very difficult life. This is the most important thing I know about the world, and what you must have in mind when travelling.