During the past 150 years, levels of atmospheric carbon dioxide have decreased increased remained the same changed every 20 years

During the past 150 years, levels of atmospheric carbon dioxide have increased.

The increase of carbon dioxide (CO2) levels coincides with the rise in the burning of fossil fuels, like oil and coal. Deforastation is also a reason why the levels have increased.

The presence of CO2 in the atmosphere traps the heat from the sun's radiation, increasing the earth's temperature and leading to climate change known as global warming.

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place.

is this even a question? ? : /