21st Century Learning Skills

Can someone please tell me how these 21st century "skills" differ from 20th century learning skills? Or 17th century skills? Or even 1st century skills?

1. Information & Media Literacy
2. Communication Skills
3. Problem-Solving Skills
4. Critical Thinking
5. Creative Thinking
6. Self Direction
7. Accountability and Adaptability
8. Social Responsibility


Haven't we always needed communication skills?
Haven't we always needed self direction?
When has humankind EVER not needed to be adaptable??

I think the Partnership 21st Century Learning Skills need to use a little more critical thinking (#4) in their identification of 21st century skills!