I = PAT that human population may stabilize at around 11.2 billion in 2100, the I=PAT equation will continue to be relevant for the increasing human impact on the environment in the short to mid-term future. Increased population increases humans' environmental impact in many ways, which include but are not limited to: The variable A, in the I=PAT equation stands for affluence. It represents the average consumption of each person in the population. As the consumption of each person increases, the total environmental impact increases as well. A common proxy for measuring consumption is through GDP per capita. While GDP per capita measures
Estimated number of civilian guns per capita by country Estimated number of civilian guns per capita by country This is a list of countries by estimated number of privately-owned guns per 100 persons. The "Small Arms Survey 2017" provides estimates of the total number of civilian-owned guns in a country. It then calculates the number per 100 persons. This number for a country does not indicate the percentage of the population that owns guns. All the numbers in the main column of the table below are from the annex table of "Small Arms Survey 2017." The briefing paper for it says: "Numbers provided here include all firearms in civilian