The phrase "a quantity to reduce" is correct and usable in written English.
It can be used in contexts where you are discussing a specific amount or measurement that needs to be decreased or diminished.
Example: "In order to meet the budget constraints, we need to identify a quantity to reduce in our expenses."
Alternatives: "an amount to decrease" or "a figure to cut down".
This means that even though we know how to generate electricity this way, and we have many decades of experience doing it, in the U.S. these plants will never be built in sufficient quantity to reduce global warming.
Biodiesel critics, including some environmentalists, say it will never be produced in large-enough quantities to reduce air pollution or oil consumption.
This work aims to evaluate the inclusion of waste tyres within Glass Fiber Reinforced Concrete panels as a way to reduce the quantity of sand while giving a second use to a recycled material thus reaching a double ecological benefit.
The comparison of the results relating to the two electrodes indicates that these materials have a power to reduce the quantity of the organic matter in the electrolyzed solution.
The concept of controlled subsurface drainage can be applied as a means to reduce the quantity of drainage effluent.
Prescribed fires are a common management practice in the Mediterranean region and can be an alternative to reduce the quantity of fuel and hence decrease the wildfire risk.
It is now a normative process to reduce students by the quantity of their debt (or lack thereof) at the beginning of each semester.
Dimensionless quantities are used to reduce the number of parameters to be taken into account.
But unlike active pure culture of L. acidophilus, the metabolic activity of LAB present in the whey was not strong enough to produce an adequate quantity of LA required to reduce pH to the desired level within 3 days of fermentation.
In California (the world's major almond growing region), it is generally considered that approximately two nuts per tree is an acceptable quantity of mummy nuts to reduce adverse impacts (http://www.ipm.ucdavis.edu/PMG/C003/m003dcmummynut.html).html
