Using Google

Slavery:
I used the Good information about Slavery then i got 25,900,000 results. I wanted to narrow my infromation so i clicked advanced search. I put Slavery, then Harrit Tubman, then Martin Luther King my results were 443,000 lower then the frist time.

Global Warming:
I used Good information about Global Warming the results were 87,300,000 results so i was like i dont only global warming i wanted to find out about more not just that so i clicked on advanced search. I typed global warming then pollution and then animals i got 1,990,000 results lower then the first time.