One piece of evidence is that there are many dry river channels in the martian Southern Hemisphere, like those found on earth. This suggests that water made these channels, and that means that at some point there was water on mars. Water means that the temperature was above 320F for at least some part of the year, and that it was humid enough so that the water would not instantly evaporate.
Make it have more carbon dioxide and cause it to have a green house effect.
An extinct shield volcano
well, maybe because of Martian volcanoes
ice crystals
NASA photographs of Mars are the best evidence that water has been flowing on Mars recently. During warmer periods in Mars' atmosphere, the photographs show streaks that look like streams. Scientists agree that this is evidence of water on Mars.
Thick clouds keep us warmer at night. This happens because clouds stop some of the heat from earth escaping into the atmosphere.
The Earth's atmosphere traps heat.
The atmosphere is actually warmer near the surface because the sun's rays are warming the physical earth, not the air directly. The atmosphere is then heated through convection from the warmed earth. As the warmer air rises, it expands and cools off.
Well, atmospheres help absorb heat, so it traps in heat from the sun to make it warmer, so the absence of an atmosphere on the moon affects it by making it cooler because without an atmosphere, there is no way to trap in and keep heat.
makes the earth warmer.
If the ice core is thicker at certain areas, that suggests that it was warmer at that period of time. This is because when it is warmer, there is much more snowfall than when it is colder, and this snow compresses the ice, leaving it thicker and with less air bubbles.
Warmer atmosphere
NASA photographs of Mars are the best evidence that water has been flowing on Mars recently. During warmer periods in Mars' atmosphere, the photographs show streaks that look like streams. Scientists agree that this is evidence of water on Mars.
Infrared are the radiations that contain heat. Absorbing them will make atmosphere warmer.
Besides the fact that temperatures get as low as -87°C (that's pretty "cool"), there is the fact that Mars was once warmer, had a thicker atmosphere and had plenty of liquid water flowing on it.
The atmosphere is too cold and thin for liquid water today, yet we see evidence that water flowed on the surface in the past.
There is no insulating LAYER of Carbon Dioxide round the Earth. The Carbon Dioxide is mixed up with the Oxygen and Nitrogen in Earth's atmosphere and is not present in the atmosphere as a layer. If the absolute amount of Carbon Dioxide in the atmosphere increases, the Earth would get warmer.
No
There is no insulating LAYER of Carbon Dioxide round the Earth. The Carbon Dioxide is mixed up with the Oxygen and Nitrogen in Earth's atmosphere and is not present in the atmosphere as a layer. If the absolute amount of Carbon Dioxide in the atmosphere increases, the Earth would get warmer.
The main reason is that it is farther away from the Sun, and so light is less intense than on Earth. In addition, Earth has a thicker atmosphere which keeps it's surface warmer.
It is thinner when warmer, and thicker when colder.