What would it take to determine the climate has changed?

Sea level rise is another clue that tells us Earth's climate is getting warmer. But melting ice is not the only cause of rising sea levels. As the ocean gets warmer, the water actually expands! Scientists have observed that the sea level has risen 7 inches in the last 100 years.

Explanation:

Because the hotter it get the more water in the ocean the colder less water in the ocean or it could stay the same

the endomembrane system i think