The Pipeline. Not a sweeping legislative on all pipelines but rather just the one. As in the one and only that required him to specifically change the the previous administration’s policy because it was protected by a still in effect executive order on the pipeline that overruled certain regulations (and therefor arguably unconstitutional).
As for the Paris Climate Accords, you might be correct. However, the reason why nothing will be done about it (Save perhaps the next Republican President entering another Executive Action of withdrawal) is that the Accords allow each country to set their own parameters of limitations. Not only that, but several international treaties since the 1930s have been formed through executive action as well without the need of ratification by the senate likely due to the interpretation of the powers in Article II, Section 2, Clause 2 which states the President needs two-thirds Advice and Consent. Not necessarily ratification.
As for ERCOT being unable to meet the power demands due to Biden’s emission limits, this is untrue. ERCOT released a statement that their primary issue for being unable to meet power demands stemmed mostly from instruments being frozen and unable to operate at the needed capacity.
In fact, the timeline of events show the exact opposite of what you claim. On February 14th, ERCOT told its customers to conserve power to meet the likely high demands for the descending winter storm. That same day, they requested assistance from the Department of Energy to temporary lift federal emissions limits until February 19th so that they could operate at maximum capacity. The Energy Department responded that same day with an order granting them permission to do so!
So, no. Biden’s emission standards did not cost lives! You can argue that it could’ve had the DoE denied their request, but since they didn’t, your claim is false.