Question

Which events may cause long-term changes in climate?

Answer 1

In our ecosystem or current environment, The most scary reason that might happen is the volcanic eruptions. It will cause a long term changes in the climate since when it erupted, together with the lava are many chemicals that mixes with the air.

Answer 2

The answer is Changes in the shape of earth orbit. If the earth's orbit put the earth closer to the sun, then the global temperatures of the earth would rise permanently. Conversely, if the orbit change puts the earth further from the sun, then the earth global temperature would drop permanently.