Jennifer Marohasy: Causal Linkage between Carbon Dioxide and Global Warming

I've been having some discussions with a colleague who has never thought too hard about anthropogenic global warming.

Anyway, he says there must be some work/some research results that have been published in reputable scientific journals that:

1. examine the causal link between anthropogenic carbon dioxide and warming, and

2. quantify the extent of the warming from anthropogenic carbon dioxide.

What he really want is links to research papers or citations to research papers.