Why you ask? Because of the increasing variety of modern marvels that would have been impossible had those studies not produced exquisitely accurate facts and figures.
~ ~ ~ ~ ~ ~ ~
~ ~ ~ ~ ~ ~ ~
"Each sample has a volume of 4~6 cm3. CO2 concentration was measured with IR tunable diode laser spectroscopy, scanning a single vibrational-rotational absorption line." https://nsidc.org/data/docs/agdc/nsidc0202_wahlen/
- Microwave emissions of oxygen molecules gives us satellite temperature sensing of the atmosphere.
- Nitrogen - Nitrogen collisions form part of the basis of the GH effect on places like Saturn's moon Titan.
Careful selection of wavelengths allows measurement of many atmospheric gases.
National Institute of Standards and Technology, USA
~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~
First direct observation of carbon dioxide's increasing greenhouse effect
February 25, 2015, Lawrence Berkeley National Laboratory
"We see, for the first time in the field, the amplification of the greenhouse effect because there's more CO2 in the atmosphere to absorb what the Earth emits in response to incoming solar radiation," says Daniel Feldman, a scientist in Berkeley Lab's Earth Sciences Division and lead author of the Nature paper.
A quick review of "CO2 science"
You've probably heard that carbon dioxide is warming the Earth. But how exactly is it doing it?
Lieven Scheire uses a rainbow, a light bulb and a bit of quantum physics to describe the science behind global warming.
More detailed understanding requires dedicating yourself to some serious study and homework:
"Global Warming - Understanding the Forecast." Professor David Archer