Scientists predict that heatwaves and hurricanes will happen more often if the world keeps warming up.
Nobody can prove that globe warming is a long-term trend,but it looks more and more likely.
Sun is nearly 5 billion years old, halfway through its life as a star. Although the Sun has grown slowly hotter, carbon dioxide in the Earth's atmosphere has decreased since life first began, and this balance kept the Earth's temperature steady until recently. After warming the Earth, a lot of heat energy returns to space. This trapped heat warms the planet. Human activities add carbon dioxide and other gases to the air, adding to nature's own greenhouse effect.