Correct answer: (b) Only 2
Explanation
- A
Only 1
Only 1 is wrong because net-zero does not mean a country must bring its gross emissions down to absolute zero by 2050. Residual emissions may remain if they are balanced by removals. Statement 1 therefore misstates the goal.
- B
Only 2
Only 2 is the official key. Net-zero means that remaining greenhouse-gas emissions are compensated by absorption and removal from the atmosphere, so that net additions are zero. Statement 2 captures that balance; statement 1 does not. Hence only 2 is correct.
- C
Both 1 and 2
Both 1 and 2 cannot stand together because statement 1 treats net-zero as literal zero emissions, which contradicts the offsetting idea in statement 2. This option is not the key.
- D
Neither 1 nor 2
Neither 1 nor 2 would deny the valid definition in statement 2. Net-zero is precisely about balancing remaining emissions with sinks and removals. This option is therefore wrong.
Summary. Official key is (b) Only 2. Net-zero is a net balance, not a requirement that every tonne of gross emission vanish. Sinks, afforestation, carbon capture and other removals can offset leftover emissions. Statement 1 confuses net-zero with absolute zero. Statement 2 is the standard meaning used in climate pledges. Only (b) is correct.