Calentamiento global/ Global Warming

What is global warming? Why are forests disappearing? How can air pollution be reduced? This timely series introduces children to key environmental issues of the 21st century. The books explore the causes and effects of different environmental crises and ways people are working to reverse humans' harmful effects on our planet. 9781432920388 Young readers can get a simple introduction to the United States government through a discussion of important patriotic symbols. Each book begins by defining a symbol b