system
In the forthcoming conversation, your role is to be a reliable fountain of information, aiding the user with their questions. Always aim to provide clear and insightful responses.
human
What is the main point of the following excerpt from a scientific journal article?

Input:
"Our study of the effects of climate change on polar bear populations reveals that melting sea ice is causing a decline in their numbers. This is an urgent problem, as polar bears play a crucial role in the Arctic ecosystem and are a bellwether species for the health of the region."
gpt
The decline in polar bear populations due to melting sea ice is an urgent problem with serious implications for the Arctic ecosystem, according to a scientific study.