'severe negative impact' is correct and usable in written English.
You can use it when you want to describe the effects of something that is particularly serious or damaging. For example, "The recent natural disasters have had a severe negative impact on the region's economy."
For others, the urge can't be controlled, which leads not only to incontinence but also to a potentially severe negative impact on their quality of life.
Trees adapt to arid regions by adopting root patterns that allow soil water uptake by shallow roots and groundwater use by deep roots, thus climatic variation itself may not bring severe negative impact on trees.
"A small shock in the future could trigger a severe negative impact and will be difficult to contain if these chronic deficits are not effectively managed," said Joyce Luma, the head of the World Food Program's Food Security Analysis Unit who was a co-leader of a mission to North Korea in September.
The calamity might be avoided if the Treasury Department makes payments to bondholders to avoid a default, but even with this contingency plan (which the Treasury shows no sign of putting into place), the spectacle of a government that cannot finance its routine operations would doubtless translate into a severe negative impact on private confidence and spending.
On Friday, June 21, Airbus published a risk-assessment of a 'No Deal' Brexit warning of a severe negative impact Airbus UKK production.
Thus, the fact that we find no differential effect of peer quality on cumulative GPA based on own student ability suggests that higher STEM peer quality has a more severe negative impact on the STEM grades of less prepared students.
Human intervention has accelerated since the industrial revolution and in many cases, such changes have been unsustainable, leading to severe negative impacts.
Similarly, the project also integrated university, population and the government around the purpose of controlling the advancement of diseases that have caused severe negative impacts on society.
These reforms had particularly severe negative impacts on Māori and Pacific Islanders, who were disproportionately employed in low-skilled manufacturing jobs that largely disappeared with the end of industry support and import restrictions.
The tailings and waste water resulting from the exploitation contains high concentrations of ammonia nitrogen (NH4 +-N), which have caused severe negative impacts on local ecosystems and human health (Åström 2001).
The potential risks associated with such facilities include: (1) the release of radiation, which could have severe negative impacts on human health; and (2) a self-sustaining fire if and when the water is drained and the fuel rods are exposed to the air.
