Solutions to American crisis

There are few crisis that US is facing as of right now. Few of them are climatic change and Obesity. Climatic change is already happening and one of the greatest environmental, social and economic threats that is facing the planet. The European Union is committed to working constructively for a global agreement to control climate change, and is leading the way by taking ambitious action of its own. Since 1850, earth's surface temperature has been risen to .76 degrees. Most of the warming that has occurred over past 50 years has been cause by the human activities. To stop the climate change, global green house and gas emissions must be reduced significantly. The European Union has been at the front in the international efforts to combat climate change and it has been taking serious steps to address its own green house gas emissions since the 1990's. (http://ec.europa.eu/environment/climat/home_en.htm).
We can find a solution to Obesity by exercises, eating healthy food, avoiding junk foods. I dont understand that how people can get chubby after knowing the ad effects of it. Like I am sure everyone who eats junk food knows that its not good for our health but they still keep eating it. And blames it on the companies. The companies are not forcing any one to buy their products. So I say its our own fault that we become obese. We should know what to and what not to eat. Even if we eat, we need to burn our calories by doing some exercises. Another reason why people are obese is because of Internet and TV. People don't go outside of their house now because of TV. They got too lazy and they just want to stay in their house and watch TV. Even when i go home, i don't feel like doing anything else but to watch TV and go online.