The phrase "already ensures that" is correct and usable in written English.
It can be used when stating that something has been established or guaranteed in advance.
Example: "The new policy already ensures that all employees receive equal pay for equal work."
Alternatives: "already guarantees that" or "already secures that".
New York already ensures that a minimum-wage worker in a low income family will earn well over $7.15 per hour through the New York earned-income credit supplement, which is one of the most generous in the United States.
Not unreasonably, the government already ensures that those in need have access to free school meals, so it beggars belief that we are now going to see a policy instated which will subsidise the children of affluent families.
The fact that eLife is an open access journal already ensures that anyone who is interested in an article can read it free of charge.
The US has already ensured that it will not be subject to that court's jurisdiction.
This case has already ensured that the Hong Kong journal achieved a much greater audience.
Pressure from Britain has already ensured that a proposal for "European armed forces" has been dropped from the draft conclusions.
Some have already been changed and we have already ensured that there is legislation before Parliament to tighten up the powers under which David Miranda was held.
The German team has already ensured that it will advance to the quarterfinals; it would win its group with a victory Tuesday against France.
The practice has already ensured that only the best foreign medical graduates practice in the United States and at a small cost ensures that the already high quality of American physicians remains so.
Globally P&G has already ensured that 99% of all materials entering their plants leave as either finished product or end up being reused, recycled or converted to energy.
But he has already ensured that he will stay on as prime minister, and on April 15th he accepted the "invitation" to become leader of the ruling United Russia party, a political movement created by the Kremlin.
