SCIENCE 2M03 Study Guide - Midterm Guide: Arctic Sea Ice Decline, Glacial Motion, Sea Level Rise
9 Dec 2018
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Greenhouse gas (ghg) emissions, specifically carbon emissions, have caused earth"s average surface temperature to increase by 1. 1*c since late 19th century: https://climate. nasa. gov/evidence/ - nasa climate change evidence. >95% chance that the current warming trend is mostly due to human activity since mid-20th century and proceeding at an unknown rate. Earth-orbiting satellites and other technology let us collect info about our planet and its climate on a large scale and over many years, which shows signals of a changing climate. Heat-trapping nature of co2 (& other gases) demonstrated mid-19th century: gases have ability to affect transfer of infrared energy through the atmosphere. Increased levels of greenhouse gases cause the earth to warm in response. Co2 into atmosphere since start of industrial revolution; co2 absorbed by upper layer of ocean increasing by 2 billion tons per year. Sea levels and temperatures rising; increasingly severe weather: https://www. cbc. ca/news/technology/climate-change-deadly-heat-waves-south-asia-1. 4231281.
