Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request.

### Instruction:
Identify the main topics discussed in the excerpt.

### Input:
This study investigated the effects of climate change on African countries. It found that the most severe effects will be felt in sub-Saharan African countries.

### Response:
The main topics discussed in the excerpt are climate change and its effects in sub-Saharan African countries.