Holden is popular as a baby name for boys, and it is also considered trendy. The name's popularity has been rising since the 1980s; before that, it was of very modest use only. At the recent peak of its usage in 2012, 0.058% of baby boys were given the name Holden.It ranked at #296 then.olden is popular as a baby name for boys, and it is also considered trendy. The name's popularity has been rising since the 1980s; before that, it was of very modest use only. At the recent peak of its usage in 2012, 0.058% of baby boys were given the name Holden.
Overview of Greenhouse Gases. : 1  Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and wood products, and also as a result of certain chemical reactions (e.g., manufacture of cement).
Highlights: 1  Human activities have increased the natural concentration of carbon dioxide in our atmosphere, amplifying the natural greenhouse effect. 2  The global average carbon dioxide concentration in 2015 was 399.4 parts per million (ppm).