It is Venus.
carbon dioxide
the earth is one
It's mainly to do with its closeness to the sun, compared with the other planets. Although mercury is closer, Venus is hotter due to it's thick carbon dioxide atmosphere, which holds the energy from the sun a lot better than mercury, which has no atmosphere.
Venus and Mars haveatmospheres mostly consisting ofcarbon dioxide.
planets
Two other planets besides Earth.Venus has a runaway greenhouse effect, with most of its atmosphere carbon dioxide, and a temperature of 460° Celsius.Mars has a very faint greenhouse effect, with a little carbon dioxide, but hardly any atmosphere at all.Saturn's largest moon, Titan, has a greenhouse effect, with large concentrations of methane.
There are two such planets, Mars and Venus. Venus has a much thicker atmosphere than Mars, but both atmospheres are about 95% carbon dioxide.
The earth
Earth's atmosphere has a unique composition compared to other planets. It contains a significant amount of oxygen, which supports the existence of complex life forms. Additionally, Earth's atmosphere has an ozone layer, which protects the planet from harmful ultraviolet radiation. Lastly, Earth's atmosphere is denser than most other planets, allowing for the regulation of temperature and the retention of water on its surface.
venus
That's Earth.
venus (closer to 97%)