Being part of the water molecule is one big effect.
Being part of the sun is another.
Being crucial to photosynthesis in plant life is another.
Combining with carbon and oxygen to make hydrocarbons is another: this is organic chemistry, a huge branch of chemistry and, like water, vital to life in earth.
Its effects and uses are so vast and extensive there would be no planet earth without hydrogen.
Water vapor is a greenhouse gas that contains only hydrogen and oxygen.
The only pure hydrogen is found in the atmosphere as H2. Under the ground are many compounds containing hydrogen such as methane gas and water.
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Hydrogen
There is a greenhouse effect on Earth because three-atomed gases in the atmosphere retain heat and ensure that the earth stays warm. Other examples of a greenhouse effect are the atmospheres of Venus and Mars. Mercury has an atmosphere but has no greenhouse effect, as the main gases (hydrogen, helium and oxygen) are not greenhouse gases. So Mercury is a non-example of the greenhouse effect. The moon is also a non-example, as it has no atmosphere at all.
Oxygen is more abundant than hydrogen. In fact it is the most abundant element on Earth.
Hydrogen
Hydrogen, Helium
Always.
no
No.
By volume, hydrogen accounts for around 0.000055%.