2. What are the causes of global warming?
The cause of the natural global warming of the Earth is a phenomenon that has been occurring for millions of years, due to special characteristics of our atmosphere, which we have called the greenhouse effect. Infrared rays, one of the components of the sun’s rays, come from space, bounce off the surface of the planet and try to escape back to the cosmos, but a part is trapped by some gases in the atmosphere, especially carbon dioxide (CO2). As a result, the greenhouse effect occurs, a condition that allows an acceptably uniform temperature, key to life on the planet. If this did not happen, Earth would be an icy planet, probably uninhabited like most others, or at least not fit for life as we know it.
The causes of anthropogenic global warming are due to greenhouse gas (GHG) emissions, produced by human activity, which adds extra amounts of CO2 and other greenhouse gases to the atmosphere. GHG emissions intensified since the beginning of the industrial revolution, in 1750, and especially in the 1950s. Since then, the increase in temperature on our planet has been recorded. Most of this increase comes from the burning of fossil fuels, such as coal, gas and oil, used in industry and transport. Another part comes from the deforestation of forests and the intensification of the livestock industry.
CO2 is only 0.04% of the total gases in the atmosphere, but with such minimal participation, it is responsible for the greenhouse effect. The concentration of CO2 in recent years broke a record by passing the 400 PPM, parts per million, for the first time since Homo sapiens appeared on Earth.