SAS025 Essay Evidence

How much of the world’s GHG emissions are contributed by transportation?

abt 21% worldwide, 33% in the US

How much of the world’s GHG emissions are contributed specifically by light duty vehicles?

10% worldwide, 19% in the US

how much of worldwide total carbon emissions are from buildings?

A quarter. Mostly space and water heating, and lighting

proof of climate change

guy stewart callendar, keeling curve, Mann hockey stick

proof that climate change is anthropogenic

recent studies indicate the rise in global average surface temps since 1951 is mostly associated w changes in anthropogenic GHGs and aerosols. IPCC models of climate separated the influence of naturla and anthropogenic climate forcing factors, such as GHGs, to show that human activities are responsible for most of the 0.5C rise in global temperatures from 1970-2000.

Keeling Curve

shows steady rising atmospheric CO2 concentrations from about 315 ppm in 1957 to abt 417 ppm in 2020; a 32% increase

Guy Stewart Callendar

observed based on measurements of carbon dioxide and temperature readings from weather stations that world temps had increased more than 0.2C between 1890 and 1935; proposed that rising CO2 caused the change

Mann “hockey stick”

average annual temps over time showed clear warming trend - straight up after the 1900s