Tony Dokoupil talks with Naomi Oreskes one the authors of the book “The Collapse of Western Civilization.” Later, Matt Crawford explains the dangers of headspace pollution. We take a look at one teenager’s journey to becoming an environmental activist. What does the Vatican have to say about the ills of the world? And we take a look at which countries are better equipped to survive a massive natural disaster. Greenhouse airs on Thursdays at 12pm ET.April 30, 2015