When the U.S. Environmental Protection Agency increased safety and environmental standards for cars in the 1970s, automakers responded. Although they had to adhere to the new rules, they didnB次元官网网址檛 base their entire response on safety or pollution concerns. Instead, they looked for loopholes.

Under the U.S. Clean Air Act, vehicle manufacturers were required to more than double fuel efficiency for cars over the following decade. Canada and other countries followed suit. But trucks, vans and SUVs werenB次元官网网址檛 subject to the same regulations, so automakers started marketing them as family vehicles.

In many countries, greenhouse gas emissions have been falling in some sectors, thanks largely to a shift from coal-fired power. But theyB次元官网网址檝e been rising in the transportation sector. ThatB次元官网网址檚 bad news. Transportation accounts for about 14 per cent of global emissions and is now the largest source of CO2 emissions in the U.S., mostly from cars and trucks.

In Canada, the largest share of emissions is from the oil and gas industry, at 26 per cent, but transportation, at 24 per cent, is a close second. While emissions from electricity generation and heavy industry have been declining in Canada since 1990, emissions from oil and gas and transportation have been rising, by 76 per cent for oil and gas between 1990 and 2015, and 42 per cent for transportation. According to the Government of Canada, car emissions went down by 23 per cent over that period, but B次元官网网址渆missions from light trucks (including trucks, vans and sport utility vehicles) doubled.B次元官网网址�

Fuel efficiency, hybrid and electric vehicles and cleaner transportation options such as car-share programs, transit and cycling infrastructure are necessary to reduce pollution and climate change. But the growing worldwide market for trucks, SUVs and B次元官网网址渃rossover vehicles,B次元官网网址� which combine car and SUV design, are negating advances in those areas.

As the New York Times points out, B次元官网网址淔or the first time, S.U.V.s and their lighter, more carlike cousins known as B次元官网网址榗rossoversB次元官网网址� made up more than one in three cars sold globally last year, almost tripling their share from just a decade ago, according to new figures from the auto research firm JATO Dynamics.B次元官网网址� In the U.S., low gas prices spurred a boom in B次元官网网址渓ight-dutyB次元官网网址� vehicles like SUVs, which accounted for 63 per cent of 2017 vehicle sales.

In Canada, according to the government, B次元官网网址淪ince 1990, the increase in the number of light trucks has been more than three times greater than the increase in the number of the overall fleet of passenger on-road vehicles.B次元官网网址�

Pickup truck sales are also booming, with the Ford F-series poised to beat out the Toyota Corolla as the worldB次元官网网址檚 top-selling vehicle.

The UN Global Fuel Economy Initiative concludes that global fuel efficiency for new cars has to improve by three per cent a year just to stabilize emissions. As the New York Times reports, B次元官网网址淏etween 2005 and 2008, the average fuel economy of new cars worldwide improved by about 1.8 percent a year,B次元官网网址� but the B次元官网网址減ace has slowed to 1.1 percent in 2015.B次元官网网址� As countries like China and India accelerate their embrace of car culture, the problem will only get worse.

Even though trucks and other large vehicles are useful for many types of work, theyB次元官网网址檙e often unnecessary as personal vehicles. Too many SUVs on city streets often transport only a driver, and thereB次元官网网址檚 little evidence that many have ever been off-road. SUVs donB次元官网网址檛 necessarily contribute to overall increased safety either, because theyB次元官网网址檙e more prone to roll over, and even though people in an SUV may avoid death or serious injury in a collision, people in smaller cars that collide with the larger vehicles are more likely to be killed or seriously injured than if they collided with a smaller car.

Bigger vehicles mean greater profits, and they help keep the oil and gas industry thriving. That both industries prioritize profits over the need to address pollution and climate change is unconscionable.

ItB次元官网网址檚 up to industry and governments to take the major steps to combat climate change and reduce pollution, but individuals also have a responsibility. Personal transportation choices can make a major difference. Driving SUVs and trucks when less-polluting options would serve as well or better is irresponsible. We owe it to ourselves and to the rest of the world to do better.

David Suzuki is a scientist, broadcaster, author and co-founder of the David Suzuki Foundation. Written with contributions from David Suzuki Foundation Senior Editor Ian Hanington.

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