Ample evidence now exists to show that worldwide environmental changes are occurring; one example is the
A)increased NPP observed within the world's aquatic ecosystems.
B)widespread occurrence of invasive species.
C)moderate decline in atmospheric carbon dioxide concentrations.
D)expansion of forested land as tree-replanting efforts become more accepted.

Question

Quizplus · Accepted Answer

The widespread occurrence of invasive species is a clear indication of global environmental change. As human activities continue to alter ecosystems around the globe, many previously isolated areas are becoming more connected, allowing for the spread of non-native species that can outcompete or prey on native species, disrupt ecosystem processes, and cause economic harm. The impacts of invasive species are well-documented and a growing concern for conservationists and land managers worldwide. None of the other answer choices are supported by current evidence - NPP in aquatic ecosystems has been variable, atmospheric carbon dioxide concentrations have been increasing, and while there are tree-replanting efforts underway, they are not sufficient to counterbalance global deforestation trends.

Ample Evidence Now Exists to Show That Worldwide Environmental Changes