Some of the sun's UV rays can be absorbed by the Earth's surface or bound back off. Although this would be a "good" thing, it is not. These very rays cause the ozone layer to deplete over long periods of time from the rays "breaking it.
RSOE EDIS : international disaster and global climate website. So much real-time info about geo-global events (volcanic eruptions, earthquakes, wildfires, etc) Including a great site dealing with Global Climate Change.