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Harvard team finds large-scale US wind power would cause warming that would take roughly a century to offset

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All large-scale energy systems have environmental impacts, and the ability to compare the impacts of renewable energy sources is an important step in planning a future without coal or gas power. In the journal Joule , Harvard researchers report the most accurate modelling yet of how increasing wind power would affect climate.

Wind 315
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IEA: global CO2 emissions rebounded to their highest level in history in 2021; largely driven by China

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billion tonnes, their highest ever level, as the world economy rebounded strongly from the COVID-19 crisis and relied heavily on coal to power that growth, according to new IEA analysis. Coal accounted for over 40% of the overall growth in global CO 2 emissions in 2021, reaching an all-time high of 15.3 billion tonnes.

Emissions 370
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ICCT LCA study finds only battery and hydrogen fuel-cell EVs have potential to be very low-GHG passenger vehicle pathways

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Natural gas does not offer climate benefits compared to gasoline and diesel, and many biofuel pathways do not, either. Drivers of plug-in hybrid electric vehicles rely too much on the gasoline engine for this pathway to be a long-term climate solution, the ICCT said.

Hydrogen 418
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Electric vs. Gasoline Cars: Uncovering the Real Climate Savior

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For instance, electricity generated from coal or natural gas is associated with higher carbon emissions, while renewable sources like wind or solar energy contribute negligible carbon pollution. Notably, in 2020, renewable energy sources rose to become the second-most dominant source of electricity in the United States.

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Global Carbon Project: Global carbon emissions growth slows, but hits record high

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The findings are outlined in three new papers published in Earth System Science Data , Environmental Research Letters , and Nature Climate Change. The decline of coal use in the European Union and United States is overshadowed by surging natural gas and oil use around the world, according to the researchers.

Carbon 195
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EIA: CO2 emissions from US power sector have declined 28% since 2005

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In the United States, most of the changes in energy-related CO 2 emissions have been in the power sector. In 2016, natural gas generation surpassed coal as the largest source of electricity generation. This growth has been driven largely by state policies and federal tax incentives that encouraged adoption of renewables.

2005 414
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EIA: US energy-related CO2 fell by 2.8% in 2019, slightly below 2017 levels

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CO 2 emissions from coal fell by 14.6%, the largest annual percentage drop in any fuel’s CO 2 emissions in EIA’s annual CO 2 data series dating back to 1973. The United States now emits less CO 2 from coal than from motor gasoline. Source: US Energy Information Administration, Monthly Energy Review.

2019 273