is global warming a natural disaster..?? or humans themselves are responsible ?

Water vapor constitutes Earth's most significant greenhouse gas. Water vapor is mostly of natural origin (except for the latter, which is mostly anthropogenic). Human activities contribute slightly to greenhouse gas concentrations through farming, manufacturing, power generation, and transportation. However, these emissions are so dwarfed in comparison to emissions from natural sources we can do nothing about, that even the most costly efforts to limit human emissions would have a very small-- perhaps undetectable-- effect on global climate.

For global warming humans are responsible...Its not a natural disaster....Because of exhaust of deadly gases from industries , cars , bikes, factories etc. These are the reason for global warming....