The phrase "lessen negative impact" is correct and usable in written English.
You can use it when you are trying to describe a situation where something has been done in an attempt to reduce the negative effects of something else. For example: "The company implemented a new policy to lessen the negative impact of its recent layoffs."
Scientists study particular environmental factors, seeking ways to identify, predict, and lessen negative impacts.
According to job demand and control models, the ability of an employee to pace oneself and make task decisions can lessen negative impacts.
In an attempt to lessen the negative impact on people, the government implemented subsidies, decreased taxes and tariffs, and instituted other fiscal measures.
To lessen the negative impact of this phenomenon, a tailor-made refeed strategy was designed based on the exhaustion of key nutrients during cell growth.
There is a need for an intervention thinking mindset like a local processing mindset in order to lessen the negative impact of country of origin effect framed against the bias of where a particular product is manufactured (Ke Zhong, 2015).
The HIV/AIDS-related issue has given rise to a priority concern in which potential new therapies are increasingly highlighted to lessen the negative impact of highly active anti-retroviral therapy (HAART) in the healthcare industry.
Another benefit smart people enjoy when they divorce without litigating is that it tends to lessen the negative impact on their children, who aren't forced into the middle of a legal battle.
By reusing and recycling products, you can reduce your indirect water (and energy) use and subsequently lessen your negative impact on water resources which, in turn, can adversely affect food and energy production.
With the advent of the Integrated Resorts, which are casino-based vacation resorts, in 2005 Chia expressed concern in Parliament over whether the Government had systems and institutions in place to lessen their negative impact such as problem gambling and the spectre of people gambling away family assets.
This would likely lessen the negative impact of deficiencies of, for example, an inadequate training tool/simulator.
