There are many environmental issues in the world today. Some have been around for many years, others have become a major concern throughout more recent years, and others are new or reoccurring.
The first environmental issue that comes to mind is environmental pollution: this includes pollution of the land (land fills, need for recycling, farming that damages the soil, etc.), and radon which comes from the ground beneath houses. Water pollution is another stemming from chemicals, run off from land treated with pesticides, asbestos poisoning from the use of asbestos in homes, schools and old buildings, and industrial pollution in the from of nuclear energy (including thermal pollution) and electrical towers.
Other pollution is seen in polluting disasters caused by man on a large scale. Most recently we saw the enormous oil spill caused by BP Oil, which may not be on the news as much now, but will affect the environment for year to come, along with those spills of the past. There is also shipping pollution based on materials released into the water by increased water trade.
Remember, too, air pollution—smog, global warming and smog (found especially in areas of concentrated chemically-related industry), and global warming.
There is great concern for the pollution that may travel from Japan due to failure of nuclear fallout after the recent tsunami. There is great debate raging about the ramifications of this tragedy on the rest of the world, including the United States.
Finally, another form of pollution is that of humans by other humans: specifically in the processing of foods: this includes adding hydrogenated oils to foods to preserve them, which causes serious health risks over time, and the addition of steroids and antibiotics in food, and the impact this has over time, especially with children.
Also included are products—generally "natural" products that have not been tested by the FDA, that are easily available on shelves at pharmacies and food stores. Many of these carry risks that have not be determined because no long-term studies have been run to check for side-effects and what is actually in these products. Just because you can buy it and it says "natural," does not mean it is safe, and these things can pollute one's body.
Hope this is of some help.