With that the amount of alumina released into the mesosphere and upper stratosphere — the otherwise pristine middle layers of the atmosphere ... demise of natural space rocks such as asteroids ...

oil and natural gas to generate energy). Human activities have been the main cause of rising carbon dioxide levels in our atmosphere since the 1800s. The emergence of life on our planet added a new ...

Many human activities release polluting gases into the atmosphere, such as farming animals for food, burning fossil fuels and deforestation. Resources ... These layers each have different ...