The cool cities are carbon free cities with zero waste. These cities will contain many things like public commercial, residential zones, cultural and sports zones and resort zones. Also, these cities will reduce carbon emissions by 60% so global warming will decrease.Using green roofs in cool cities is the main way to reduce carbon emissions by 60%.The new Abu Dhabi Central is a good example for those mechanical roofs that respond to the temperature and will close up in summer. Moreover, Green vehicle, Energy efficiency, and Renewable Energy are major solution to reduce carbon emissions in these cities. Let me explain some details about these solutions. Using hybrid vehicles which are vehicles with low fuel consumption will reduce emission of carbon dioxide because of the electric motor that each car has. Using the light emitting diode (LED) instead of using Ordinary light will save more energy because it turns off if there enough lights. Finally, producing energy from renewable sources like sun and wind instead of using fossil fuels will reduce the amount of carbon dioxide that cause global warming.
In my opinion, these future cities will help to reduce the percentage of carbon dioxide emissions but there are some disadvantages like cost. The cost of building cool cities is too expensive and there's too much effort and time to build them. That means people can’t afford to live there.

An Inconvenient Truth is a movie was presented by Al Gore in 2006 who was the Vice President of the United State. This movie shows the danger of global warming and its effect on our world. Al Gore discusses this issue with evidences such as; graphs, images and some statistics. This movie was widely interested by people because it was presented from political person. Al Gore makes his presentation funny to encourage people to see movie until the end. Also, he used a part of the animation to explain the global warming. Al Gore began the movie showing some images of our earth that taken from space. According to Al Gore, our atmospheric layer became thinner every day. The atmospheric layer was affect by the green houses gasses and the reflection of the sun emission. Human activities also mentioned as a reason the global warming. All these reasons increase the temperature of earth in the last two decades. In addition, Al Gore showed a graph that explains the relationship between the Carbon dioxide level in the earth and the increase in temperature. Moreover, higher level record of CO2 ever was recorded in 2005 and it is getting higher and higher. Also, some horrible images of the Katrina hurricane and the collapse of many ice sheets in many places like Antarctica and Greenland were shown too as results of global warming.
