GEOLOGY

Detailed explanation-1: -Prior to the industrial Era, the cause of climate change was some natural and environmental factors. The events like volcanic eruption and changes in the sun’s intensity.

Detailed explanation-2: -On geologic time scales (i.e. hundreds of thousands to millions of years), plate tectonics and the repositioning of continents cause volcanism, mountain-building and large-scale climate changes such as glaciation, humid periods (i.e. green periods with intense photosynthesis) and desertification.

Detailed explanation-3: -Up until the early 19th Century, a series volcanic eruptions were causing the Earth to cool.

Detailed explanation-4: -Geological records show that there have been a number of large variations in the Earth’s climate. These have been caused by many natural factors, including changes in the sun, emissions from volcanoes, variations in Earth’s orbit and levels of carbon dioxide (CO2).

Detailed explanation-5: -In principle, ‘pre-industrial levels’ could refer to any period of time before the start of the industrial revolution. But the number of direct temperature measurements decreases as we go back in time.