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Unformatted text preview: ay to provide new capacity for intercity travel, and adds a layer of redundancy and reliability that
highways and airports cannot match.) Adv: Climate Change 1AC/2AC Add-On
Warming is real and anthropogenic – continued emissions will result in a mass death and
Prothero, Professor of Geology at Occidental College in Los Angeles, and Lecturer in Geobiology at the
California Institute of Technology, 2012. (Donald “How We Know Global Warming is Real and Human Caused”
Skeptic VOl 17 iss 2)
<<How do we know that global warming is real and primarily human caused? There are numerous lines of evidence
that converge toward this conclusion. 1. Carbon Dioxide Increase. Carbon dioxide in our atmosphere has increased
at an unprecedented rate in the past 200 years. Not one data set collected over a long enough span of time shows
otherwise. Mann et al. (1999) compiled the past 900 years' worth of temperature data from tree rings, ice cores, corals, and direct
measurements in the past few centuries, and the sudden increase of temperature of the past century stands out like a sore
thumb. This famous graph is now known as the "hockey stick" because it is long and straight th...
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