Major factor that's not considered in climate change information

Over the course of my reading, I've discovered something that's quite surprising, but also not talked about much; the fact that much of Earth's atmosphere, mainly the component gas Oxygen, has been escaping into space. This is not good folks. That means that curbing global warming could mean that the Earth might very likely become increasingly colder, because if the atmosphere consistently escapes into space, then the atmosphere can effectively become less dense, or in other words, become thinner. This means that the greenhouse effect might get reduced by such an extent, that we might enter a new ice age, exacerbated by the solar minimum, and by soot being thrown into the air by volcanoes.