"due contribution" is both a correct and usable phrase in written English.
You can use it to refer to the necessary actions and efforts of someone or something in order for a goal or project to be achieved. For example, "Your due contribution to the group project was essential to its success."
But what exactly should each nation's "due contribution" be?
Xie Zhenhua, head of the Chinese delegation at the Doha climate talks, responded, saying: "We are working together with other countries on global climate change, and we will make our due contribution to that end".
Calling the Sept. 11 attacks against the United States "very regretful and tragic," an editorial by the official KCNA news agency said, "It may be a right option taken in line with the policy of each country opposed to all forms of terrorism to make a due contribution to the efforts of the international community to eliminate the root cause of this terrorism".
In a statement, Calpers said that it would participate in the bankruptcy proceedings and at the same time "aggressively pursue all past due contributions" and would consider appealing.
Most of the Nazi Party's money, he wrote, came from membership dues, contributions at rallies and party publications.
During shooting, the screenplays continued to evolve, in part due to contributions from cast looking to further explore their characters.
... With greater connectivity strength, the recurrent network translated activity and information due to contribution of activity from intrinsic network dynamics.
Due to contribution from scatter of high-energy photons, planar method 1 produced higher CNF value than the other methods.
Higher concentration of Na observed in station 7 may be due to contribution from silicate weathering process and agricultural sources.
Our detailed analyses using NR2A- and NR2B-selective antagonists reveal that the larger LTP in transgenic hippocampal slices was due to contribution from the increased NR2B-containing NMDARs.
The latter figure, based solely on thermal expansion, will likely be higher due to contributions from melting glaciers and ice sheets.
