Global warming is a problem for the Earth right now and it will continue to be in the future if we don't make a change in our pollution. Burning fossil fuels (which is currently our main source of energy) releases lots of carbon dioxide into the atmosphere. This website presents wind and solar power as environmentally friendly alternatives for sources of energy and gives information on how they can be used.
This website presents the causes and effects of the exploitation of animals. It gives specific reasons as to why they are abused and the effects that are left from the abuse.
This website gives a nice overview of the green revolution as well as the impacts it had, positive and negative, and the social and agricultural problems it caused.
This website is great if you are looking for energy resources. The left side shows a list of different methods that produce energy and gives information about each of them including their pros and cons. It also explains the basics of how each method works and where we can best use them to produce energy for our population.
This is a very in-depth explanation of Ozone Depletion, and it offers solutions to the very real problem. It is a fairly long read, but I highly suggest giving it a chance, as it enlightened me to many unique and rarely talked about facts about ozone depletion.