The passage explains that geoengineering refers to large-scale efforts aimed at altering Earth's climate systems to combat climate change, highlighting approaches such as solar radiation management and carbon capture. While these methods hold promise to reduce global warming, the passage emphasizes several concerns:
Unforeseen ecological impacts: Intervening in natural systems at a large scale could cause unexpected harm to ecosystems.
Ethical implications: Manipulating natural processes raises moral questions about human intervention in the environment.
Governance and coordination: The passage notes ongoing debates over how such interventions should be regulated and coordinated globally.
Reviewing the answer choices:
(A) is incorrect because the passage acknowledges geoengineering’s potential to mitigate global warming, not a lack of it.
(B) is correct as it directly reflects the concerns highlighted regarding ecological impacts and ethics.
(C) is incorrect because the passage states there is debate about governance, not an absence of it.
(D) is incorrect since the passage describes multiple interventions, not limited ones.
Therefore, option B best matches the concern described in the passage.