7 . Casting blame is natural: it is tempting to fault someone else for a mistake rather than taking responsibility yourself. But blame is also harmful. It makes it less likely that people will own up to mistakes, and thus less likely that organizations can learn from them. Research published in 2015 suggests that firms whose managers pointed to external factors to explain their failings underperformed companies that blamed themselves.

Blame culture can spread like a virus. Just as children fear mom and dad’s punishment if they admit to wrongdoing, in a blaming environment, employees are afraid of criticism and punishment if they acknowledge making a mistake at work. Blame culture asks, “who dropped the ball?” instead of “where did our systems and processes fail?” The focus is on the individuals, not the processes. It’s much easier to point fingers at a person or department instead of doing the harder, but the more beneficial, exercise of fixing the root cause, in which case the problem does not happen again.

The No Blame Culture was introduced to make sure errors and deficiencies (缺陷) were highlighted by employees as early as possible. It originated in organizations where tiny errors can have catastrophic (灾难性的) consequences. These are known as high reliability organizations (HROs) and include hospitals, submarines and airlines. Because errors can be so disastrous in these organizations, it’s dangerous to operate in an environment where employees don’t feel able to report errors that have been made or raise concerns about that deficiencies may turn into future errors. The No Blame Culture maximizes accountability because all contributions to the event occurring are identified and reviewed for possible change and improvement.

The National Transportation Safety Board (NTSB), which supervises air traffic across the United States, makes it clear that its role is not to assign blame or liability but to find out what went wrong and to issue recommendations to avoid a repeat. The proud record of the airline industry in reducing accidents partly reflects no-blame processes for investigating crashes and close calls. The motive to learn from errors also exist when the risks are lower. That is why software engineers and developers routinely investigate what went wrong if a website crashes or a server goes down.

There is an obvious worry about embracing blamelessness. What if the website keeps crashing and the same person is at fault? Sometimes, after all, blame is deserved. The idea of the “just culture”, a framework developed in the 1990s by James Reason, a psychologist, addresses the concern that the incompetent and the malevolent (恶意的) will be let off the hook. The line that Britain’s aviation regulator draws between honest errors and the other sort is a good starting-point. It promises a culture in which people “are not punished for actions or decisions taken by them that match with their experience and training”. That narrows room for blame but does not remove it entirely.

9 . Research has found that using wood for construction instead of concrete and steel can reduce emissions. But Tim Searchinger at Princeton University says many of these studies are based on the false foundation that harvesting wood is carbon neutral (碳中和). “Only a small percentage of the wood gets into a timber (木料) product, and a part of that gets into a timber product that can replace concrete and steel in a building,” he says. Efficiencies vary in different countries, but large amounts of a harvested tree are left to be divided into parts, used in short-lived products like paper or burned for energy, all of which generate emissions.

In a report for the World Resources Institute, Searchinger and his colleagues have modelled how using more wood for construction would affect emissions between 2010 and 2050, accounting for the emissions from harvesting the wood. They considered various types of forests and parts of wood going towards construction. They also factored in the emissions savings from replacing concrete and steel.

Under some circumstances, the researchers found significant emissions reductions. But each case required what they considered an unrealistically high portion of the wood going towards construction, as well as rapid growth only seen in warmer places, like Brazil. In general, they found a large increase in global demand for wood would probably lead to rising emissions for decades. Accounting for emissions in this way, the researchers reported in a related paper that increasing forest harvests between 2010 and 2050 would add emissions equal to roughly 10 percent of total annual emissions.

Ali Amiri at Aalto University in Finland says the report’s conclusions about emissions from rising demand are probably correct, but the story is different for wood we already harvest. “Boosting the efficiency of current harvests and using more wood for longer-lived purposes than paper would cut emissions,” he says. “We cannot just say we should stop using wood.”

10 . Teenagers who spend more time on after-school activities and less than two hours of screen time after school are more mentally (心理上) healthy, according to a study published in the journal Preventive Medicine. The new study was carried out by researchers from the University of British Columbia.

The study used information collected from more than 28, 000 seventh-grade Canadian students between 2014 and 2018. The students first answered questions about their usage of screen time after school, including how much time they spent watching TV, Netflix or something else. Then, students reported how many days they had taken part in after-school activities such as sports or arts programmes. After that, researchers asked students to describe their state of mind. For example, when given a statement such as “I start most days thinking that I will have a good day”, they could choose to what level they agreed with it on a scale (等级).

Some of the results were expected, researchers said in the study. Students with no after-school activities usually had high levels of screen time, for example. And they expected girls would score higher on negative indicators (消极指标) of mental health, as earlier research had found that they tended to have higher levels of anxiety (焦虑) compared to boys.

What was noteworthy, researchers say, is that even among students who took part in after-school activities, 46% still went beyond the recommended screen time of two hours. At the same time, 67% of students who didn’t take part in after-school activities also had more than two hours of screen time. Together, this suggests high screen time among teenagers generally.

“The findings suggest that after-school activities are valuable for the happy growing of teenagers,” the study said. “While past studies have proved the importance of after-school activities for social and academic (学业的) development, the present study shows their importance for good mental health results.”