Climate change in the form of global warming refers to the rise in average surface temperatures on Earth. The primary cause of climate change is the burning of fossil fuels, such as oil and coal, which emits greenhouse gases into the atmosphere—primarily carbon dioxide. The gases trap heat within the atmosphere, which can have a range of effects on ecosystems, including rising sea levels, severe weather events, and droughts that render landscapes more susceptible to wildfires. Other human activities, such as agriculture and deforestation, also contribute to the proliferation of greenhouse gases. While some quantities of these gases are a naturally occurring and critical part of Earth’* temperature control system, the atmospheric concentration of carbon dioxide did not rise above 300 parts per million between the advent of human civilization roughly 10,000 years ago and 1900. Today it is at about 400 ppm, a level not reached in more than 400,000 years.
I. The atmospheric concentration of carbon dioxide, today,
i. has increased from below 300 ppm to 400 ppm in the last 116 years
ii. did not change much from the advent of human civilization
iii. did not change much after 1990.
II. The primary cause of global warming is/ are
i. rising sea levels, severe weather events, and droughts
ii. burning of fossil fuels such as oil and coal
iii. both i and ii above.
III. Agriculture
i. is helping in decreasing the emission of greenhouse gases
ii. contributes to the emission of greenhouse gases
iii. helps in decreasing sea level and earth’* temperature.
The correct answers to I, II and III are:
A. iii, ii, ii respectively
B. iii, i ii respectively
C. i, ii, ii respectively
D. iii, i, i respectively
