I love some songs with a universal life/social theme. Here are a few:

Used to Be - Stevie Wonder & Charlene
Powerless (Say What You Want) - Nelly Furtado
If Everyone Cared - Nickelback
Dare You to Move - Switchfoot
Only Hope - sung by Mandy Moore, written by Switchfoot
Defying Gravity - sung by Idina Menzel in "Wicked" written by Stephen Schwartz
You Gotta Be - Des'ree
Perhaps Love - John Denver
The Rose - Bette Midler
Unwritten - Natalie Bedingfield

I'll be updating this once in a while - give me suggestions!