Given a list of topics, find a source or a citation for each topic.
1. **Climate Change:** Climate Change | United Nations. (n.d.). United Nations. Retrieved April 6, 2021, from https://www.un.org/en/sections/issues-depth/climate-change/

2. **US Presidential Elections:** (2021, January 20). How the President is Elected. USAGov. Retrieved April 6, 2021, from https://www.usa.gov/election.
Topics: Climate Change, US Presidential Elections
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:
Given a list of topics, find a source or a citation for each topic.

### Input:
Topics: Climate Change, US Presidential Elections

### Response:
1. **Climate Change:** Climate Change | United Nations. (n.d.). United Nations. Retrieved April 6, 2021, from https://www.un.org/en/sections/issues-depth/climate-change/

2. **US Presidential Elections:** (2021, January 20). How the President is Elected. USAGov. Retrieved April 6, 2021, from https://www.usa.gov/election.