Science - Percentages

45%

Percent of the world’s meat and fish consumed by 20% of the population in developed countries

58%

Percent of the world’s total energy consumed by 20% of the population in developed countries

84%

Percent of the world’s total paper consumed by 20% of the population in developed countries

87%

Percent of the world’s total automobiles consumed by 20% of the population in developed countries

50%

Portion of the calories eaten by humans that come from grains

50%

The portion of lead in leaded paint

91%

Percent of America’s wetlands that are freshwater wetlands

50%

Temperate rainforests’ ecological productivity compared to a tropical rainforest

33%

Boreal coniferous forests’ ecological productivity compared to a tropical rainforest

33%

Temperate grasslands’ ecological productivity compared to a tropical rainforest

0-5%

Deserts’ ecological productivity compared to a tropical rainforest

5-10%

Tundra’s ecological productivity compared to a tropical rainforest

60%

Genetic similarity between humans and bananas

30%

Percent of normal cheetah sperm cells

99%

Percent of Earth’s species that have gone extinct

40%

The percentage of red spruces in elevated forests

71%

Percent of Earth’s water that comes from its oceans

95%

Percent of biomass in salt marshes that comes from grass species

90%

Energy loss between each trophic level

90%

Percent of all new loblolly plantings in the Southern U.S. over 1.5 million acres made up of genetically selected trees

60-76%

Percent of life killed during the Permian-Triassic Extinction

33%

The portion of American population increases in recent years due to immigration

90-95%

Percent of marine species that went extinct in the Permian-Triassic Extinction

92%

Percent of ethanol that comes from corn and corn byproducts

92%

Genetic diversity of loblolly trees present in one loblolly stand

100%

Percent of Iceland’s power that comes from renewables

73%

Percent of Iceland’s power that comes from hydroelectric energy

27%

Percent of Iceland’s power that comes from geothermal energy

60%

The estimated increase in food productivity required to feed the human population in 2050

95%

Percent of calories and nutrients that come from 30 plant species

0.2%

Population growth rate in high-income regions of the world

1%

The portion of Earth’s water that is usable for humans

1.5%

Population growth rate in low-income regions of the world

2%

Percent destruction of tropical forests per year

2.1%

Human population growth rate in 1963

3%

The portion of Earth’s water that is fresh water

6%

Portion of the lithosphere that is iron

6.2%

Percent of America’s total energy that comes from hydropower

8%

Percent of American energy that came from nuclear power in 2022

10%

Decrease in snow cover since 1960s

12%

Percent gain in wood volume per harvest in genetically modified loblolly trees

13%

Percent of American energy that came from renewable energy in 2022

15%

Percent of electricity production that came from natural gas in 2000

16%

Percent of global soil lost to erosion

17%

The reduction in food production due to soil degradation

18%

Percent of electricity production that comes from nuclear power plants

19.5%

Percent of electricity production that came from coal-fired plants in 2022

20%

Percent of agricultural land that is irrigated

28.7%

Percent of American renewable energy that comes from hydropower

34%

Percent of American corn that was Bt corn in 2002

35%

Portion of the Earth that is iron

36%

Percent of American energy use that goes to transportation

36%

Efficiency of conventional energy-generating plant

37%

Estimate of global energy efficiency in 2015

37%

Percent of American renewable energy that comes from biomass production

38%

Percent of the world’s land that is used for agriculture

40%

Portion of food production that benefits from irrigation

40%

Percent of global cropland that has been degraded by erosion, compaction, waterlogging, or salinization

40%

Percent of global food produced by irrigated land

40%

Percent of electricity production that came from natural gas in 2022

42%

Efficiency of newer energy-generating plants

50%

Percent of all commercial timber that comes from the U.S. and Canada

50%

Percent of electricity production that came from coal-fired plants in 2005

50%

Increase in atmospheric carbon since 1750

55%

The percent of Jordan and Israel’s water that is lost to pipe leakage

60%

Efficiency of conventional irrigation

60%

Efficiency of natural-gas power plants

60%

Percent of energy that natural gas produces in comparison to carbon dioxide/coal

66%

Percent of American oil use that goes to transportation

66%

Percent of American biomass energy that comes from wood and wood products

2/3rds

Fraction of oil use caused by American transportation

2/3

Portion of the world’s agricultural land that is used for livestock grazing

70%

Red spruce population decline between 1964 and 1982

70%

Percent of land vertebrates that went extinct in the Permian-Triassic Extinction

71%

Percent of American corn that was genetically modified in 2002

75%

Portion of the Earth’s surface covered in water

75%

Percent of American soybeans that were genetically modified in 2002

78%

Percent of the atmosphere that is nitrogen gas

79%

Percent of American energy that came from fossil fuels in 2022

80%

Portion of the Earth that is the mantle

80%

Percent of worldwide calories that come from wheat, rice, corn, potatoes, sweet potatoes, and cassava

0.83-0.9%

Human population growth rate in 2023

90%

Percent of American corn, soybeans, and cotton that were genetically modified in 2020

90%

Percent of loblolly plantings in the Southern US that used genetically selected trees

95%

Efficiency of drip irrigation

40-50%

Percent of solid waste material removed in primary treatment

80-90%

Biological activity in soil that comes from organisms

85-90%

Percent of solid waste material and pollutants removed through secondary treatment

85-90%

Methane percentage in natural gas