EVERYDAY SCIENCE

Detailed explanation-1: -As of May 2022, the average monthly level of CO 2 in Earth’s atmosphere reached 421 parts per million by volume (ppm). “Parts per million” refers to the number of carbon dioxide molecules per million molecules of dry air. Previously, the value was 280 ppm during the 10, 000 years up to the mid-18th century.

Detailed explanation-2: -Carbon dioxide now more than 50% higher than pre-industrial levels.

Detailed explanation-3: -Concentrations of these greenhouse gases are measured in parts per million (ppm), parts per billion (ppb), or parts per trillion (ppt) by volume. In other words, a concentration of 1 ppb for a given gas means there is one molecule of that gas in every 1 billion molecules of air.

Detailed explanation-4: -Methane is an important trace gas in Earth’s atmosphere. Even though it only makes up 0.00017% (1.7 parts per million by volume) of the the atmosphere, methane traps a significant amount of heat, helping the planet remain warm and habitable.