Very easy
read the excerpt from catching sun rays.

but there is another benefit: switching to renewable energy can create jobs. one environmental group says solar power could mean hundreds of thousands of jobs in the united states. for example, the largest solar farm on the east coast in new york created more than 200 local construction jobs. and the farm makes enough electricity each year to power 4,500 homes!

why does the evidence provided in the excerpt make the author's argument more effective?

it is vague.
it is specific.
it is complicated.
it is scientific.