The result is sobering. In Germany, the annual mileage of all vehicles is 736 million km for all land vehicles together.https://www.kba.de/…/verkehr_in_kilometres_node.html Of this, the proportion of cars is overwhelmingly high, roughly as high as that of all lorries. If one assumes an average consumption of 12L/100km for all these vehicles (is already high In other countries, especially China and the USA, which have the highest emissions, this is not much different, even slightly less than for us. In other words, the 3% share of road transport (the share of aircraft is not even one seventh of it: 15% of the total CO2 emissions) are just over 247,000t per year (with an average of 2.8kg CO2/litre fuel). The Earth’s atmosphere has a weight of 5.15 · 10 high 18 kg, i.e. a little over 5 billion tons of gas.https://en.wikipedia.org/wiki/earth atmosphere Of this, the share of CO2 is only 0.04%, i.e. 206 trillion tons of CO2 in the atmosphere. With a man-made CO2 emission of 35 billion tons, this is only 0.017% per year, in 100 years with a constant emissions of wa 1.7% caused by humans and of which only 3% by road vehicles, i.e. only 0.05% in 100 years. So many times to the facts. Cars are not climate killers, but their share is far too small. And even all the CO2 caused by humans is ridiculously little, not worth mentioning with the proportion of just 1.7% of the total CO2 in the atmosphere, estimated at 100 years. Compared to this, an annual geogenic (i.e. natural) annual CO2 emissions of 97% are compared. The total human share is only 3% per year.https://www.focus.de/wissen/klima/tid-8638/discussion_aid_234329.html And it has been shown that a higher CO2 share leads to higher CO2 consumption in the plant world, and again a balance between emissions and consumption. Also, the annual average temperatures have been falling again for about 15 years (since 2004). At the time of the Romans 2000 years ago, these were significantly higher than today. Therefore, the Romans could Eu ropa also conquer in sandals, up to Scotland.