"This truly is one of the great environmental scourges of our time", May will say, according to excerpts of a speech released by her office.
The UK government has unveiled a bold plan to eradicate all avoidable plastic waste by 2042. She outlined plans for a tax or charge on single use packaging and urged retailers to introduce plastic-free aisles.
In 2015, Britain introduced a charge of 5 pence on all single-use plastic bags provided by large shops, which led to an 83 percent reduction in United Kingdom plastic bags used in the first year.
The Plan read: "WRAP is working to develop a new cross-sector commitment to tackle plastic waste". He said: "We will bring together every body, business and organisation involved in the life-cycle of plastics to make the move from a throw away culture to one where resources are used over and over again".
Earlier this week, a ban on plastic microbeads used in cosmetics and personal care products came into force across Britain.
"We look forward to working with government to help the United Kingdom progress towards a truly circular economy by helping to reduce littering, significantly increasing recycling infrastructure, ensuring all packaging used for food and drink consumed "on the go" is captured for recycling, encouraging design for recyclability and the use of recycled materials in new low carbon products".
"What we need is serious action immediately".
May's proposals did not entirely please environmental groups, either.
"Respecting nature's intrinsic value and making sure we are wise stewards of our natural world is critical if we are to leave the environment in a better state than we inherited it".
While there has been some positive reaction to the plans, there has also been criticism, with many commenting on the timeframe, which they see as too long, and the lack of legislation to back up the plans, meaning they could simply be ignored.
"The Scottish Government has committed to a deposit return scheme covering plastic bottles, and now it is proposing a ban on the manufacture of plastic-stemmed cotton buds", said Iain Gulland, chief executive of Zero Waste Scotland in an email. Shadow environment secretary Sue Hayman called the plant "insubstantial" and "weak" and said the government has "missed a critical opportunity" to make progress in protecting the environment. "The Prime Minister's speech and the plan itself contain very little new material, mostly repeating and repackaging existing policies and previous announcements", she said.