1. Describe changes in Earth's globally averaged temperatures between 1880 and 2000

2.changes in the levels of carbon dioxide in the atmosphere between 1880 and 2000

3.what seems to be the connection between earth's air temperatures and levels of carbon dioxide in the atmosphere

4. what do many scientists conclude in the cause of increased carbon dioxide levels

1 According to an ongoing temperature analysis conducted by scientists at NASA's Goddard Institute for Space Studies (GISS), the average global temperature on Earth has increased by a little more than 1° Celsius (2° Fahrenheit) since 1880

2 Until the past two centuries, the concentrations of CO2 and CH4 had never exceeded about 280 ppm and 790 ppb, respectively. ... These increases in greenhouse gas concentrations and their marked rate of change are largely attributable to human activities since the Industrial Revolution (1800).

3 When the carbon dioxide concentration goes up, temperature goes up. When the carbon dioxide concentration goes down, temperature goes down.

4 On Earth, human activities are changing the natural greenhouse. Over the last century the burning of fossil fuels like coal and oil has increased the concentration of atmospheric carbon dioxide (CO2). This happens because the coal or oil burning process combines carbon with oxygen in the air to make CO2.