How can we save our planet

IN SPITE OF the environmental gloom hanging over the earth, we would like to think that it would survive. After all, it is our home—and hopefully the home of our children and their children. But we should not just think about problems, we should solve them. The truth is that while most people are concerned about the environment, many think nothing of throwing trash on the ground, dumping garbage in a river or treating badly with animals.

• Žemės planetos kilmė ir raida
• Žemės grupės planetos
• Planetų duomenys