In Texas, the largest oil producer in the United States, the demand for carbon dioxide is soaring, because it can help squeeze oil out of formations deep in the earth. That's why the idea of of capturing it and pumping it underground is gaining traction in the power sector. It sounds like an exercise in environmental idealism: Take the heat-trapping gas — belched prolifically from coal plants, which generate 45 percent of the nation’s electricity — and bury it, benefiting the atmosphere and combating global climate change. Of course, it is something of an environmental conundrum that stowing the greenhouse gas underground can also help to produce more fossil fuels.

The executive director of the Texas Parks & Wildlife Department discusses the acquisition of a large piece of remote and rugged land along the Devils River; next steps for the bighorn sheep released in Big Bend Ranch State Park; the threats posed by invasive species like the giant salvinia, an exotic, rootless fern, and zebra mussels — and what the state's budget shortfall might mean for his agency and for the state's lands, waters, fish, wildlife and parks.

Come January, as Texas lawmakers begin work to pass bills and tackle the yawning budget gap, they will go up against a simple but implacable barrier: time. Texas is one of a dwindling number of states whose legislatures hold scheduled meetings only every two years. Just three other, far smaller states — Montana, North Dakota and Nevada — still have biennial legislative sessions. Lawmakers differ on whether this is a good thing or a bad thing, especially for budgeting. Regardless, Texas seems unlikely to change anytime soon.

Over the next several months, hundreds of electric and plug-in hybrid cars will arrive in Texas cities. They will emit little pollution and be cheaper to operate than conventional vehicles. For the state government, however, the advent of alternative-fuel vehicles creates a long-term concern: They will generate little or no gas tax revenue — a key funding source for keeping the state's roads and bridges in good repair.

Every politician needs a villain. George W. Bush had Saddam Hussein; Barack Obama had George W. Bush. Gov. Rick Perry has the EPA., which has had the audacity to order Texas to do more to clean its air.

Energy is never far from the agenda at the Legislature. This year, Sunset Advisory Commission reviews of oil and gas and electricity regulators will keep the sector in the spotlight, as will renewed clamor for legislation — however unlikely to happen in a tough budget environment — to aid clean energy.

The Texas state climatologist on the reasons for rising temperatures, why international science on climate change is fundamentally sound (no matter what state officials say), what he thinks of our fight with the EPA and how long the drought in Central Texas is likely to continue.

East Texas has none of the wind-power potential of West Texas. But it does have plenty of pine trees. And so, 40 miles apart, two first-of-their-kind power plants are going up near Lufkin and Nacogdoches. They will burn the woody debris to make steam, and that steam will turn generators to make electricity. But environmentalists, pulp mills and locals have concerns about the plants — which could also take an economic hit, because they are coming online during a slump in energy prices.

The sprawling capital of the oil industry — the fourth-largest city in the U.S. — has embarked on a range of green initiatives in an effort to keep up with the times and, hopefully, save money. The local-food craze is the most visible of these efforts, with the opening of a weekly farmers market and the planting of Michelle Obama-style vegetable gardens tended by city hall staff. But it is also transforming itself into an electric car hub, a national leader in wind-power investment and an advocate for energy efficiency. It even has a sustainability director hired away from, yes, San Francisco.

Next legislative session, during the few minutes not taken up with the budget, redistricting and immigration, an old stand-by of an issue — water — could creep onto the agenda. Observers say proposals on groundwater rights are probable, given that Texas is just wrapping up a process for planning the allocation of water from aquifers, while environmentalists will be pushing measures for water conservation.

For five years, the director of UT's Frank Erwin Center has been on a crusade to save energy. Fans may not notice the changes, but athletics officials on campus and around Texas are paying heed — and going green themselves.

The impoverished border town of Presidio is home to the largest battery system in the country: a $25 million contraption that's the size of a big house. That's not as weird as it seems. Partly because of an affinity for wind energy, the state has a number of experiments going in "energy storage" — often referred to as the "holy grail" of energy technology, because it can modernize the grid by more efficiently matching people's demand for power with the generation of electricity.

Rick Perry won his third full term as governor of Texas on Tuesday, defeating former Houston Mayor Bill White by a convincing double-digit margin and positioning himself for a role on the national stage. And he led a Republican army that swept all statewide offices for the fourth election in a row, took out three Democratic U.S. congressmen and was on its way to a nearly two-thirds majority in the Texas House — a mark the GOP hasn't seen since the days following the Civil War.

Since 1999, dozens of county courthouses — some dating to the 19th century — have been spruced up with the help of state funding, and workers have uncovered old artwork or other historic features. But advocates fear that the renovation program will be yet another casualty of the coming biennial budget shortfall.