The emissions humans put into the atmosphere now will affect the climate in the middle of the century and onwards. Technological change, meanwhile, could make a future transition away from fossil fuels cheap or it might not, leaving the world with a terrible choice between sharply reducing emissions at huge cost or suffering through the effects of unabated warming. Businesses that do not hedge against the threat of uncertain outcomes fail. The world cannot afford such recklessness on climate change. Which one of the following statements best reflects the crucial message conveyed by the author of the passage?

The crucial message of the passage revolves around the uncertainty of future technological solutions and the severe consequences of delaying action on climate change.

Analysis of options:

A) Businesses that cause emissions may need to close down or pay for pollution in future. This option focuses on the fate of businesses, which is mentioned in the passage as an analogy ("Businesses that do not hedge... fail") to illustrate the need for proactive action. However, it's not the central, crucial message about the world's overall strategy for climate change.

B) The only solution is technological development related to the issues of climate change. This contradicts the passage. The passage explicitly states that technological change "might not" make the transition cheap, leading to a "terrible choice." It highlights the uncertainty of technology, not its certainty as the sole solution.

C) Waiting to deal with carbon emissions until technology improves is not a wise strategy. This statement perfectly reflects the crucial message. The passage warns about the uncertainty of future technology making solutions cheap and the "terrible choice" that would result if we delay. It concludes that the world "cannot afford such recklessness," which implies that waiting is indeed not a wise strategy. The analogy of businesses failing if they don't hedge against uncertainty further supports this.

D) Since future technological change is uncertain, new industries should be based on renewable energy sources. While promoting renewable energy is a relevant solution, the passage doesn't explicitly state this specific industrial policy as its crucial message. The core warning is about the danger of waiting for technology, not a directive for specific new industry types, although that might be an implied action. The message is broader: don't delay action due to uncertain technological promises.

Therefore, C best captures the author's warning against inaction based on uncertain future technological improvements.