It doesn't, because the Earth has no "hydrogen cycle" if you mean the gas in elemental form. All the Earth's hydrogen is locked up in water and other chemical elements, and reactions involving these simply transfer the hydrogen into other compounds' molecules.
Respiration is part of the carbon cycle and does not affect global warming.
Global warming increases temperature.Water level rises up.Amount of water in atmosphere is affected.
Global warming increases temperature.Water level rises up.Amount of water in atmosphere is affected.
Global warming increases temperature.Water level rises up.Amount of water in atmosphere is affected.
Global warming increases temperature.Water level rises up.Amount of water in atmosphere is affected.
The idea that Global Warming is a natural cycle is well understood from paleo.
Carbon cycle
The theory of global warming became popular in the early 70's. As for how old actual global warming is, is debatable. Some argue that global warming is a natural cycle the earth goes through every so many centuries.
global warming
Co2 is a greenhouse gas. It cause for global warming.
become more extrem
Global warming is the name given to the recent (over 200 years) gradual increase in the temperature of Earth's atmosphere.