Our planet and its inhabitants - including we humans - are in a precarious position as we approach Earth Day, April 22.
While global warming is widely accepted as a reality by scientists and many governments and industrial leaders, progress to curb greenhouse gases and other forms of pollution remains limited. The current economic climate will likely make pollution control efforts more difficult, analysts say.
Recent studies, as well as the 2007 report by the Intergovernmental Panel on Climate Change (IPCC) have pointed to some of the likely effects of uncurbed greenhouse gas emissions: rising global temperatures, rising sea levels, Arctic sea ice melt, the disappear of glaciers, epic floods in some areas and intense drought in others.
These effects are intensified when combined with other forms of pollution the world's rising population.
Humans will face widespread water shortages. Famine and disease will increase. Earth’s landscape will transform radically, with a quarter of plants and animals at risk of extinction.
While putting specific dates on these traumatic potential events is challenging, this timeline paints the big picture and details Earth's future based on several recent studies and the longer scientific version of the IPCC report. This timeline is an updated version of one first published by LiveScience in 2007.
2008
Arctic sea ice hits its second lowest summer ice extent on record (the lowest extent was in 2007). A massive chunk of ice breaks away from Greenland's Petermann Glacier. Several breakups of ice shelves in Antarctica are observed. (NSIDC; Jason Box, Ohio State University; ESA, NSIDC)
Global oil production peaks sometime between 2008 and 2018, according to a model by a Swedish physicist. Others say this turning point, known as "Hubbert’s Peak," won’t occur until after 2020. Once Hubbert’s Peak is reached, global oil production will begin an irreversible decline, possibly triggering a global recession, food shortages and conflict between nations over dwindling oil supplies. (Doctoral dissertation of Frederik Robelius, University of Uppsala, Sweden; report by Robert Hirsch of the Science Applications International Corporation)
The Bush Administration enacts changes to the Endangered Species Act that affect reviews of government projects.
Polar bears and beluga whales are placed on the Endangered Species List. Gray wolves are delisted in certain areas.
2009
The U.S. Environmental Protection Agency declares carbon dioxide and other heat-trapping gases to be pollutants under the Clean Air Act.
An ice bridge connected to the Wilkins Ice Sheet of Antarctica breaks apart.
Many of the world's major rivers are found to be losing water. (Aiguo Dai, NCAR, Journal of Climate)
2012
The first phase of the Kyoto Protocol, an international environmental treaty created to limit the production of greenhouse gases, expires. Nations will have to draw up and enact a succesor treaty to further limit emissions, should they choose to do so.
2020
Flash floods will very likely increase across all parts of Europe. (IPCC)
Less rainfall could reduce agriculture yields by up to 50 percent in some parts of the world. (IPCC)
World population will reach 7.6 billion people. (U.S. Census Bureau)
2030
Diarrhea-related diseases will likely increase by up to 5 percent in low-income parts of the world. (IPCC)
Up to 18 percent of the world’s coral reefs will likely be lost as a result of climate change and other environmental stresses. In Asian coastal waters, the coral loss could reach 30 percent. (IPCC)
World population will reach 8.3 billion people. (U.S. Census Bureau)
Warming temperatures will cause temperate glaciers on equatorial mountains in Africa to disappear. (Richard Taylor, University College London, Geophysical Research Letters:)
In developing countries, the urban population will more than double to about 4 billion people, packing more people onto a given city's land area. The urban populations of developed countries may also increase by as much as 20 percent. (World Bank: The Dynamics of Global Urban Expansion)
The Arctic Sea could be ice-free in the summer. (James Overland, NOAA, Muyin Wang, University of Washington, Geophysical Research Letters)
2050
The Group of Eight top industrial nations has endorsed cutting greenhouse gas emission in half by this year.
Small alpine glaciers will very likely disappear completely, and large glaciers will shrink by 30 to 70 percent. Austrian scientist Roland Psenner of the University of Innsbruck says this is a conservative estimate, and the small alpine glaciers could be gone as soon as 2037. (IPCC)
Ocean acidification could kill off most coral reefs. (Ken Caldeira, Carnegie Institution of Washington, Science)
At least 400 bird species could become endangered or extinct due to deforestation and climate change. (Walter Jetz, University of California, Davis, PLoS Biology)
In Australia, there will likely be an additional 3,200 to 5,200 heat-related deaths per year. The hardest hit will be people over the age of 65. An extra 500 to 1,000 people will die of heat-related deaths in New York City per year. In the United Kingdom, the opposite will occur, and cold-related deaths will outpace heat-related ones. (IPCC)
World population reaches 9.4 billion people. (U.S. Census Bureau)
Crop yields could increase by up to 20 percent in East and Southeast Asia, while decreasing by up to 30 percent in Central and South Asia. Similar shifts in crop yields could occur on other continents. (IPCC)
As biodiversity hotspots are more threatened, a quarter of the world’s plant and vertebrate animal species could face extinction. (Jay Malcolm, University of Toronto, Conservation Biology)
2070
As glaciers disappear and areas affected by drought increase, electricity production for the world’s existing hydropower stations will decrease. Hardest hit will be Europe, where hydropower potential is expected to decline on average by 6 percent; around the Mediterranean, the decrease could be up to 50 percent. (IPCC)
Warmer, drier conditions will lead to more frequent and longer droughts, as well as longer fire-seasons, increased fire risks, and more frequent heat waves, especially in Mediterranean regions. (IPCC)
2080
While some parts of the world dry out, others will be inundated. Scientists predict up to 20 percent of the world’s populations live in river basins likely to be affected by increased flood hazards. Up to 100 million people could experience coastal flooding each year. Most at risk are densely populated and low-lying areas that are less able to adapt to rising sea levels and areas which already face other challenges such as tropical storms. (IPCC)
Coastal population could balloon to 5 billion people, up from 1.2 billion in 1990. (IPCC)
Between 1.1 and 3.2 billion people will experience water shortages and up to 600 million will go hungry. (IPCC)
Sea levels could rise around New York City by more than three feet, potentially flooding the Rockaways, Coney Island, much of southern Brooklyn and Queens, portions of Long Island City, Astoria, Flushing Meadows-Corona Park, Queens, lower Manhattan and eastern Staten Island from Great Kills Harbor north to the Verrazano-Narrows Bridge. (NASA GISS)
2085
The risk of dengue fever from climate change is estimated to increase to 3.5 billion people. (IPCC)
2100
A combination of global warming and other factors will push many ecosystems to the limit, forcing them to exceed their natural ability to adapt to climate change. (IPCC)
Atmospheric carbon dioxide levels will be much higher than anytime during the past 650,000 years. (IPCC)
Ocean pH levels will very likely decrease by as much as 0.5 pH units, the lowest it’s been in the last 20 million years. The ability of marine organisms such as corals, crabs and oysters to form shells or exoskeletons could be impaired. (IPCC)
Thawing permafrost and other factors will make Earth’s land a net source of carbon emissions, meaning it will emit more carbon dioxide into the atmosphere than it absorbs. (IPCC)
Roughly 20 to 30 percent of species assessed as of 2007 could be extinct by 2100 if global mean temperatures exceed 2 to 3 degrees of pre-industrial levels. (IPCC)
New climate zones appear on up to 39 percent of the world’s land surface, radically transforming the planet. (Jack Williams, University of Wisconsin-Madison, Proceedings of the National Academy of Sciences)
A quarter of all species of plants and land animals—more than a million total—could be driven to extinction. The IPCC reports warn that current “conservation practices are generally ill-prepared for climate change and effective adaptation responses are likely to be costly to implement.” (IPCC)
Increased droughts could significantly reduce moisture levels in the American Southwest, northern Mexico and possibly parts of Europe, Africa and the Middle East, effectively recreating the “Dust Bowl” environments of the 1930s in the United States. (Richard Seager, Lamont Doherty Earth Observatory, Science)
2200
An Earth day will be 0.12 milliseconds shorter, as rising temperatures cause oceans to expand away from the equator and toward the poles, one model predicts. One reason water will be shifted toward the poles is most of the expansion will take place in the North Atlantic Ocean, near the North Pole. The poles are closer to the Earth’s axis of rotation, so having more mass there should speed up the planet’s rotation. (Felix Landerer, Max Planck Institute for Meteorology, Geophysical Research Letters)
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