Our world is changing fast. We can travel and speak to people around the world, and use computers to do all kinds of things. But in some places, children go to bed hungry at night, and cannot drink clean water. Thousands of people cannot go to school, or live freely. And many species of animals and plants are now in danger as our climate changes and pollution worsens. These are just a few of today's many important global issues. So how and why are they changing, and are there any answers to these problems?