Correct Option
Statement 1 is correct. The passage explicitly links the "rapidly expanding human population" to "greatly modified the Earth’s ecosystems" and subsequently states that "The benefits have not been equally distributed. Some people have actually been harmed by these changes." This directly implies that the demographic expansion and its resultant ecosystem alterations have negatively impacted certain individuals or groups.
Incorrect Options
Statement 2 is incorrect. The passage indicates that "efforts to increase the production of food and fibre have decreased the ability of some ecosystems to provide clean water, regulate flooding and support biodiversity." This suggests that considerable efforts have been made to increase food and fibre production, rather than implying a lack of sufficient effort.
Statement 3 is incorrect. The passage states, "Moreover, short-term increases in some ecosystem goods and services have come at the cost of the long-term degradation of others." This contradicts the notion that harm is only short-term or that all individuals will ultimately benefit from ecosystem modifications; instead, it highlights the risk of long-term environmental degradation.