Jet engine exhaust from airliners endangers human health and adds to climate change, the government found Monday in taking the first step toward regulating those emissions.
The Environmental Protection Agency said it will use its authority under the Clean Air Act to impose limits on aircraft emissions.
Jet engines spew significant amounts of greenhouse gases, including carbon dioxide and methane, into the upper atmosphere, where they trap heat from the sun. But proposed rules such as imposing fuel-efficiency standards have faced stiff opposition from aircraft makers and commercial airlines.
Aircraft emissions were not addressed as part of the landmark global climate agreement agreed to in Paris in December.
“Addressing pollution from aircraft is an important element of U.S. efforts to address climate change,” said Janet McCabe, EPA’s acting assistant administrator for air and radiation.
McCabe said aircraft are the third largest contributor to greenhouse gas emissions in the U.S. transportation sector, and that is expected to increase. Cars and trucks already are regulated.
The EPA’s findings do not apply to small piston-engine planes or to military aircraft.
A U.N. panel in February recommended new emissions standards for international flights that require an average 4 percent reduction in fuel consumption during the cruising phase of flight. The new regulations from the International Civil Aviation Organization require that new aircraft designs meet the standards beginning in 2020, and that designs already in production comply by 2023.
Environmental groups have criticized those new international standards as too weak to actually slow global warming. Planes burn the most fuel during takeoffs and landings. Cruising at high altitudes is the most fuel-efficient period.
Environmentalists say aviation accounts for about 5 percent of global greenhouse emissions, though the U.N. and EPA cite studies concluding it’s actually less than 2 percent.
The EPA finding announced Monday is expected to result in fuel-efficiency standards for domestic carriers, which critics call long overdue. The EPA acted after a coalition of environmental organizations filed notice of their intent to sue the agency over its inaction.
Twitter will live-stream for free one Major League Baseball game and one National Hockey League game per week under a new deal.
The agreement announced Monday will allow viewers to watch games nationally that would normally be available only in the two teams’ home markets. Viewers will not need to be logged into Twitter.
The baseball games will also be available outside the U.S., with some exceptions. Twitter did not announce the game schedule Monday.
The social media network is attempting to move into live sports streaming through “over-the-top” broadcasts, which do not require a cable subscription. In April, Twitter reached a deal with the NFL to stream 10 “Thursday Night Football” games this fall.
Coding boot camp General Assembly laid off 50 people or about 7 percent of its staff on Friday, including fewer than 10 in San Francisco, its second largest market after its home base in New York.
However, the company still has more than a dozen full- and part-time job openings in San Francisco and plans to open a campus in or near San Jose this year, said Jake Schwartz, its co-founder and CEO.
Schwartz said layoffs were necessary because the company “grew 5,000 percent in the last five years in terms of revenue and more than that in terms of headcount. When you grow like that you don’t always grow the right way all around the world. Things get out of whack.”
The for-profit, nonaccredited school teaches computer programming, data science, project management and other tech skills in a variety of formats, including intensive three-month boot camps, one-night workshops and online classes. About 20 percent of its business is working with employers on classes for their employees. It is making a “huge investment” to consolidate the consumer and employer sides of its business, Schwartz said.
It is one of at least 13 immersive coding boot camps in San Francisco, and one of only four that has been approved by the California Bureau for Private Postsecondary Education.
The company had been running one-off classes and workshops in Silicon Valley but has enough demand there to open an offshoot of its San Francisco campus, Schwartz said.
Air France warns some of its flights are expected to be canceled this week due to a seven-day strike of some cabin crew members.
It will maintain most long-distance flights. It predicts more than 90 percent of such flights will run as scheduled on Wednesday, the first day of the strike, which lasts through next Tuesday.
It says flights to and from Europe and domestic flights will face more cancellations.
Two unions have called for cabin crew members to strike to protest against further decreases in the number of crew members and to call for better working conditions.
Courtesy : sfgate.com