Combine the given two facts to write a concluding fact. Note that there should be some parts of the first and second facts that are not mentioned in this conclusion fact. Your combined fact should be the result of a chain between the two facts. Chains form when two facts connect together to produce a concluding fact. An example of a chain is: "pesticides cause pollution" (fact1) + "pollution can harm animals" (fact2) → "pesticides can harm animals" (conclusion fact). Parts of the concluding fact overlap with the first and the second fact. To construct such a  concluding fact, a useful way is to borrow the subject from one fact and the ending conclusions from another fact.

Example Input: Fact 1: Grasses supply most of the food consumed by people worldwide. 
Fact 2: Wheat is a grass-type plant.
Example Output: wheat is a plant that is consumed by people worldwide.

Example Input: Fact 1: landfills have a negative impact on the environment. 
Fact 2: An ecosystem is an environment and all the members of that environment.
Example Output: Landfills have a negative impact on the ecosystems.

Example Input: Fact 1: volcanic ash in the atmosphere decreases the temperature by blocking the sun. 
Fact 2: Atmosphere is the air around an object in space.
Example Output:
volcanic ash in the air around the earth decreases the temperature by blocking the sun.