Is global warming really happening because of mankind or is just the cycle of earth?

Answer 1

not only cycle of earth is main cause of global warming and climate change but also mankind is one of the main reason and can be controlled by savings of Natural Resources,electricity,water etc and by changing the way of living

Reasonable scientists do disagree on this question. In fact, it may not be a scientific question at all, because it is difficult to formulate anthropogenic global warming into a falsifiable hypothesis. There is also the possibility, as suggested above, that both mechanisms are at work and we have no way to measure the relative magnitudes of their effects.

Answer 2

The overwhelming consensus among climate scientists is that global warming is primarily caused by human activities, such as the burning of fossil fuels and deforestation. While the Earth does undergo natural climate cycles, the current rate and extent of warming far exceed anything observed in recent history and are not consistent with natural cycles.