The climate crisis is no longer a forecast, but a reality. Glaciers are melting because of it, the climate is becoming drier, and natural disasters are becoming more frequent. And this is only part of the consequences. We can end the crisis, and in this course we will share with you some of the solutions. You will learn why global climate change is happening and how fossil fuel use affects it. We will explain what renewable energy sources are, and give simple tips on energy efficiency that everyone can apply. This course is for high school students who are interested in ecology and energy, teachers who teach science in high school and teachers of career guidance courses for young people.