Washington (CNN)While Americans were buying and opening their Christmas presents, the Trump administration's environmental regulators were wrapping up their work on some controversial issues, including some proposed rollbacks of Bush and Obama-era regulations.

Their gifts -- which you might have missed amidst the holidays -- include policies on energy efficient lightbulbs, water contamination and pesticides.
Here are the details:

Lightbulbs
The Energy Department blocked stricter efficiency requirements for many common types of lightbulbs that would have taken effect in the new year.

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Natural gas emissions
The Environmental Protection Agency announced it would expand a temporary and voluntary "self-audit" program that would cut penalties for polluters that discover, self-report and fix problems.

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Coal ash
EPA proposed granting Georgia the authority to regulate in its state the handling of coal ash, a toxic byproduct of coal-burning power plants. Coal ash, containing dangerous metals including arsenic and mercury, has typically been mixed with water to form a sludge and stored in unlined pits, which environmentalists say in many cases are leaking into groundwater.

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Pesticides
EPA proposed increasing the allowable levels of the herbicide Atrazine, which is used by professionals to kill weeds on crops and lawns. It said the proposal is one of several that would "ensure a strong and vibrant agricultural market."
The Centers for Disease Control says the chemical does not break down if it is washed into into groundwater or nearby streams, and that it has been linked to reproductive abnormalities including premature birth. . .