The phrase "negligible contribution" means that something is so small or unimportant that it does not make a significant impact or difference. Full definition
The paradox here is that many of those urban centers with almost negligible contributions to the greenhouse gases in the atmosphere are more vulnerable to the negative impacts of climate change are. (blogs.nature.com)
During the growth period, the increase in imports into developed countries was driven entirely by China (large blue bar), with other countries making negligible contributions. (carbonbrief.org)
Government spending and inventories will make negligible contributions. (canadianbusiness.com)