The phrase "a major effort is" is correct and usable in written English.
You can use it when discussing the significance or scale of an undertaking or task that requires considerable work or resources.
Example: "A major effort is needed to address the challenges posed by climate change."
Alternatives: "a significant endeavor is" or "a substantial effort is".
A major effort is under way to learn how the cancers develop in the first place.
A major effort is needed to avoid practices that exacerbate the negative impacts of food production and consumption on climate, water and ecosystems.
With union membership falling to 13percentt of the work force from 35percentt in the 1950's, union leaders bemoan labor's decline and say a major effort is needed to organize more workers and to amend the labor laws if unions are to avoid sinking into oblivion.
A major effort is under way to observe the Universe in its most vibrant epoch.
A major effort is devoted to integral experiments with the objective to provide the experimental database for testing the nuclear data and validating neutronics design calculations.
Nevertheless, a major effort is still required to harness the high potential performance of such computational framework and in this sense, an important challenge is to develop new strategies that efficiently address scheduling on the distributed, heterogeneous and shared environment of grids.
In preparation of the restoration, a major effort was carried out to design and implement a web-based IS able to host all of the data produced, to allow the conservation-restoration specialists to interact on-site with an accurate 3D representation of the elements of the fountain, and to directly reference all information and data produced on the geometry of the model.
The administration had earlier hoped to get Iran declared out of compliance this week, and a major effort was made to lobby members of the United Nations agency.
Dr. Browne said that as soon as he found out, on the night of May 31, a major effort was started at the laboratory to find the missing material.
In the years after the end of the civil war, a major effort was begun to reconstruct Beirut's devastated infrastructure.
Given India's pervading poverty, illiteracy and limited technology, a major effort was made to go door to door to check the voters' age, sex and proof of residency and to instruct them about their polling stations.
