Greenhouse Gases
Scientists analyzing ancient ice from Antarctica have found that ocean temperatures dropped by 2 to 2.5 degrees Celsius over the past 3 million years, while carbon dioxide and methane levels changed only modestly. The studies, led by researchers from Oregon State University and others, suggest factors beyond greenhouse gases drove much of Earth's long-term cooling. The findings come from ice cores at Allan Hills in East Antarctica.
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The U.S. Environmental Protection Agency has proposed eliminating its Greenhouse Gas Reporting Program, which requires large emitters to report emissions data. This move, part of broader rollbacks under the Trump administration, raises concerns about tracking national emissions and forming climate policy. Climate experts and NGOs warn that while alternatives exist, they cannot fully replace the federal system's role.