Definition: In this task, you need to write a topic word from the given fact. The topic word must have at least one word overlap with the given fact. The topic word often involves adding a new word from a related concept. In your topic word, use at least one word from the given fact. Topic words with two or more words work best.

Positive Example 1 -
Input: Fact: pesticides cause pollution.
Output: pollution harms.

Positive Example 2 -
Input: Fact: pesticides cause pollution.
Output: modern farming pesticide.

Negative Example 1 -
Input: Fact: pesticides cause pollution.
Output: computer harms.

Negative Example 2 -
Input: Fact: pesticides cause pollution.
Output: toopaste helps.

Now complete the following example -
Input: Fact: volcanic ash in the atmosphere decreases the temperature by blocking the sun.
Output: 


Output:
ash volcano.
atmosphere air.
cooler temperatures inhibit plant growth.
decrease temperature block sun.
decreased temperature can damage an ecosystem.
earth temperature increasing.
haze atmosphere.
volcanic ash block sun.
volcanic ash is deadly.
volcanic ash.
volcanic particles small.
volcanic particles.
volcanic temperature.
volcanoes temperature.