Answer: B. We cannot perform global experiments to test for outcomes associated with large-scale problems such as climate change.
Step-by-step explanation:
Environmental problems are associated with the change in the climatic conditions. These changes cannot be measured experimentally at a global level. As the climatic condition may vary from region to region all over the globe. It will be difficult to mimic the climatic conditions in experimental set-up and to draw results relating to the change in the climatic conditions.
Therefore, the problems of climate change cannot be determined experimentally at a global level.