So, 99% of the atmosphere is accounted for in those two gases.

The composition of the atmosphere has changed since the Earth was formed 4.5 billion years ago. Venus has Oxygen, nitrogen and argon are classified as permanent gases because their percentages … Reader question: I heard that carbon dioxide makes up 0.04 percent of the world's atmosphere.Not 0.4 percent or 4 percent, but 0.04 percent! The atmosphere of Mercury is one of the most tenuous in the Solar System. For example, Venus and Mars have more than 98% of their atmosphere in carbon dioxide and nitrogen, while Earth has 99% of its atmosphere in nitrogen and oxygen. Mars Earth nitrogen 3% nitrogen 78% There are two questions buried here regarding nitrogen, and they depend on where you think the nitrogen came from. Mars and Venus have essentially the same types and percentages of gases in their atmosphere. The table shows data about the atmospheres of Mars and Earth as they are now. How can it be so important in global warming if it's such a small percentage? For example, without the 0.3% of carbon dioxide in Earth’s atmosphere, Earth would be a lifeless The solar wind still blows much of it away, so sources on the planet are constantly replenishing it. Natural processes and human activity have changed the atmosphere, and continue to change it today. Scientists study the atmosphere on planets and moons in the Solar System to understand how the Earth’s atmosphere has changed. The "Goldilocks Principle" refers to the fact that Venus is too hot, Mars is too cold, but Earth is just right. Since Mars has such a thin atmosphere, radiation detected by Mars Odyssey would be roughly the same as on the surface. But trace gases with percentages below 1% are also important. The problem for Venus is it also has about 90 bar of CO2. (a) Millions of years ago the Earth’s atmosphere was probably just like that of Mars today. First, Venus has about four times as much nitrogen as Earth.
However, they have very different atmospheric densities. Generally speaking, looking at the pre-industrial atmosphere, if you don't consider water vapor (a larger variable gas), the atmosphere is about 78% Nitrogen and 21% Oxygen. most of the atmosphere. The last one percent includes various trace gases, some are greenhouse gases, and some are not. I am often asked how carbon dioxide can have an important effect on global climate when its concentration is so small – just 0.041 percent of Earth's atmosphere. The most abundant gases in the atmosphere are nitrogen at 78 percent and oxygen at 21 percent, while the trace gases methane, neon and helium make up around one-tenth of 1 percent of the atmosphere.