a number of bills to expand the death sentence to more crimes, saying: "I do not believe that further expansion of the death penalty is necessary to protect human life or provide for public safety needs." Some of the vetoes were overridden. On July 31, 2019, after Attorney General William Barr announced that the United States federal government would resume the use of the death penalty for the first time in over 20 years, Kaine co-sponsored a bill banning the death penalty. Environment, energy, and climate change Kaine acknowledges the scientific consensus on climate change, and in a 2014 Senate speech criticized climate change deniers, as well as those who "may not deny the climate science, but ... deny that the U.S. can or should be a leader in taking any steps" to address the issue. Kaine has expressed concern about sea level rise (a major consequence of climate change), and in particular its effect on coastal Virginia. In 2014, he partnered with two Virginia Republicans—U.S. Representatives Rob Wittman and Scott Rigell—to hold a conference on sea-level rise and "local adaptation efforts to protect military installations in the Hampton Roads area." Kaine endorses making coal energy production cleaner, saying that it is imperative "to convert coal to electricity with less pollution than we do today." He has criticized those who "frame the debate as a conflict between an economy and the environment", saying that "protecting the environment is good for the economy." Kaine co-sponsored the Advanced Clean Coal Technology Investment in Our Nation (ACCTION) Act, legislation to increase investment in clean coal technologies. He voted against legislation to approve the Keystone XL pipeline. Kaine supports the use of hydraulic fracturing (fracking) to harvest natural gas from shale formations. He believes this will reduce carbon pollution. Kaine voted against an amendment introduced by Senator Kirsten Gillibrand that would have repealed a provision in the Energy Policy Act of 2005 that exempts fracking from the underground injection control provisions of the Safe Drinking Water Act. As a result, regulation of fracking remains in the hands of state agencies; the EPA cannot regulate it or require a federal permit. Kaine supports exporting liquefied natural gas (LNG) to other countries. Like his fellow senator from Virginia, Mark Warner, Kaine applauded the U.S. Forest Service's plan to close most, but not all, of the George Washington National Forest to fracking and other horizontal drilling activities.