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Executive Summary
Extensive scientific evidence demonstrates that global warming is real,
that it is affecting us now, and that human activities—particularly the
burning of fossil fuels—are the primary cause.
Science is also clear about what we need to do to address the problem:
immediately and significantly reduce emissions of the pollutants that
cause global warming. Avoiding the worst consequences of global warming
will require the United States and other industrialized countries to
stabilize emissions within the next decade and reduce them by about 80
percent by midcentury.
Achieving those reductions won’t be easy, but it can be done. By
improving the efficiency with which we use fossil fuels and increasing
our use of clean, renewable energy, the United States can reduce its
global warming emissions in the near future, while putting America on a
path toward dramatically lower global warming emissions in the decades
to come.
This report lists six challenging but feasible strategies that, if
implemented, could achieve these reductions, while improving America’s
environment and our energy security.
Global warming is real, is happening now, and poses a serious threat to America’s future.
• Global average temperatures increased by 1° F in the 20th century and
are now increasing at a rate of about 0.36° F per decade. Sea levels
are on the rise, ice and snow cover are decreasing, and hurricane
intensity has increased.
• The consensus view of the scientific community is that most of the
global warming that has occurred is due to human
activities—particularly the burning of fossil fuels. Fossil fuel
consumption releases carbon dioxide, which traps the sun’s radiation
near the earth’s surface. Since 1750, the concentration of carbon
dioxide in the atmosphere has increased by 35 percent—a rate of
increase unprecedented in the last 20,000 years.
• Should the world continue on its present course, global warming
emissions could triple in the next half century, with global
temperatures increasing by 8° F by 2100. Sea levels would rise by one
and a half feet (and possibly more), threatening low-lying coastal
areas. And the ecological balance upon which life depends would be
irrevocably altered.
The United States has a responsibility to take leadership in reducing global warming pollution.
• The United States is far and away the world’s largest global warming
polluter, accounting for 23 percent of the world’s carbon dioxide
emissions.
• Should current trends continue, by 2030 the United States will emit
37 percent more carbon dioxide than it does today, increasing the
likelihood of dramatic global climate change.
• To avoid the worst consequences of global warming, scientists believe
that the United States needs to stabilize emissions within a decade,
begin reducing them soon thereafter, and cut global warming pollution
by 80 percent by the middle of this century.
The United States can achieve significant reductions in global warming
pollution by improving the energy efficiency of our economy and using
more renewable energy.
The United States can reduce its global warming emissions by as much as
19 percent by 2020 by taking a set of aggressive but achievable steps
toward improved energy efficiency and increased use of renewable
energy, within the context of mandatory limits on global warming
pollution.
1) Stabilize vehicle travel. Americans drive nearly twice as
many miles per year as they did a quarter-century ago, leading to
increased emissions of global warming pollutants. Americans are already
cutting back on driving as a result of higher gasoline prices, but many
Americans have few realistic alternatives to driving. Through changes
in public policy and development patterns, Americans can be given more
transportation choices, thus reducing the growth in vehicle travel.
Such changes include:
o Encouraging the development of compact neighborhoods with a mix of
land uses, where more tasks can be completed by foot, bike or transit.
o Expanding the reach and improving the quality of transit service.
o Supporting programs to encourage carpooling, vanpooling, telecommuting and other alternatives to single-passenger car travel.
2) Increase vehicle fuel economy standards to 40 miles per gallon and set fuel economy standards for large trucks.
The creation of federal fuel economy standards for cars during the
1970s succeeded in reducing gasoline consumption and oil imports, as
well as global warming pollution. But the fuel economy of new vehicles
is now lower than it was during most of the Reagan administration.
Several recent studies show that we could increase the fuel economy of
new vehicles to 40 miles per gallon within the next decade using
technologies that already exist or will be available soon. All types of
vehicles— from SUVs to compacts—can be designed to be far more energy
efficient. And most of the improvements in fuel economy can actually
save money for consumers over the long term, especially with gasoline
prices at nearly $3 per gallon. Similarly, major improvements in fuel
economy are possible for heavy-duty trucks, which are currently exempt
from fuel economy standards.
3) Replace 10 percent of vehicle fuel with biofuels or other clean alternatives.
Ethanol and biodiesel that are produced cleanly and sustainably have
the potential to significantly reduce global warming emissions from
transportation—especially if these biofuels are produced from plant
wastes and cellulose. Other vehicle technologies—like “plug-in”
hybrids, electric vehicles and fuel cell vehicles—have the potential to
dramatically reduce global warming emissions in the future.
4) Reduce energy consumption in homes, business and industry by 10 percent from current levels.
Dramatic improvements in energy efficiency are possible in virtually
every aspect of American life. Studies show that we could reduce our
electricity consumption by as much as 20 percent at no net cost to the
economy. For now, the U.S. can encourage weatherization of buildings,
deployment of more efficient appliances and equipment, and efficiency
improvements in industry. Soon, using new technologies such as those in
zero-energy homes, we can transform the way we consume energy and
achieve even larger improvements in efficiency.
5) Obtain 20 percent of our electricity from new renewable energy sources.
America has virtually limitless potential for the generation of power
from natural forces. By ramping up our use of wind power, solar power,
geothermal and biomass energy and other renewable forms of energy—and
using much of that energy to replace power production at dirty,
coalfired power plants—the United States could dramatically reduce
global warming emissions from electric power production.
6) Hold emissions from other sources to current levels. The five
strategies listed above would address the largest sources of energy use
and global warming emissions in the United States But some other
sources of global warming pollution—such as emissions from air travel
and emissions of some non-carbon dioxide global warming gases—are
projected to increase significantly in the years ahead. The United
States must remain vigilant about stabilizing, and eventually reducing,
global warming pollution from all sectors of the economy. Mandatory
limits on global warming emissions would help to achieve that goal.
These six steps would enable the United States to reduce its global warming emissions by 19 percent below 2004 levels by 2020.
• Taking these six steps would reduce U.S. carbon dioxide emissions by
about 23 percent and global warming emissions by about 19 percent by
2020. (See Table ES-1.)
Table ES-1. Global Warming Emission Impact of the Six Steps (million
metric tons carbon dioxide equivalent) Strategy Savings MMTCO2E
Stabilize Vehicle Travel 0* 40 MPG Fuel Economy and Heavy-Duty Truck
Fuel Economy Standards 383 10% of Transportation Fuel from Renewables
61 10% Reduction in Energy Consumption 400 20% of Electricity from New
Renewables 511 Total Savings 1355 2004 U.S. Global Warming Emissions
7122 Reduction Relative to 2004 19% * Avoids increase in emissions
resulting from projected increases in vehicle travel between now and
2020.
• In addition, taking these steps will reverse the trajectory of global
warming emissions, putting the United States on a path to achieving the
even greater reductions in global warming pollution that will be
required in the decades to come.
The United States should adopt a series of public policies designed to
quickly and significantly reduce emissions of global warming pollutants:
Cap global warming emissions. The United States should establish
mandatory, science-based limits on carbon dioxide and other global
warming pollutants that reduce emissions from today’s levels within 10
years, by 15-20 percent by 2020, and by 80 percent by 2050.
Adopt complementary policies to reduce global warming emissions. The United States should adopt policies that would achieve the targets laid out in this report, including, but not limited to:
• Transportation policies designed to reduce growth in vehicle travel and promote alternatives to automobile travel.
• An increase in federal fuel economy standards for cars and light
trucks. • Creation of federal fuel economy standards for heavy trucks.
• A renewable fuel standard requiring a significant share of transportation fuel to come from renewables by 2020.
• Policy support for the development and introduction of plug-in hybrid, electric and fuel-cell vehicles.
• Stronger appliance efficiency standards, energy efficiency programs and other policies designed to improve energy efficiency.
• A federal renewable energy standard requiring a large and increasing
share of the nation’s electricity to come from renewable energy.
Encourage action at the state level. Federal action to reduce
global warming pollution should promote innovative approaches at the
state level and not impede individual states or groups of states from
pursuing policies that go above and beyond the commitments made by the
federal government.
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