Meghan and Harry have announced their climate change pledge a day after the Queen praised Charles and William for their work - and failed to mention the Duke of Sussex
The couple's Archewell Foundation has pledged to be net zero by 2030.
Inspired by Harry and Meghan's "long-standing commitment to the planet, both together and prior to their union", the company has committed to cut its carbon emissions over the next few years.
In a statement on its website, the foundation said: "Achieving net zero carbon emissions means making a series of choices over time to make that footprint as small as possible, while compensating for any remaining emissions through high-quality carbon removal projects.
"As an organisation, we will work with an independent consultant to track all Archewell-related activities from our inception (internet use, commutes, and electricity in home offices, for example) to understand our collective footprint.
"Using 2022 as our baseline year, they will develop a plan for Archewell that aligns with the latest guidance from leading organisations, like the Greenhouse Gas (GHG) Protocol and Science-Based Targets initiative (SBTi), while offsetting remaining emissions until we achieve net zero in 2030 and beyond."
The statement added that Harry's sustainable tourism initiative Travalyst and the investing firm Ethic, which the pair have invested in, will advise the foundation on "focusing" its investments "in support of a low-carbon economy".
A spokesperson for Archewell said: "Carbon emissions are a part of nearly every activity in daily life-the food we eat, the electricity we use, and the internet we are connected to, for example. The totality of these actions comprises our 'carbon footprint'.
"Today's commitment is that Archewell, including Prince Harry and Meghan, the Duke and Duchess of Sussex, will be working with experts to assess the sum total of our emissions, and develop a plan of action to reach net zero.
"Achieving net zero carbon emissions means making a series of choices over time to make our footprint as small as possible, while compensating for any remaining emissions through investments in carbon removal projects like reforestation."
It comes after the Queen spoke of her "great pride" of her son Charles and grandson William taking on the baton to campaign for the planet.
Her Majesty said: "It is a source of great pride to me that the leading role my husband played in encouraging people to protect our fragile planet, lives on through the work of our eldest son Charles and his eldest son William.
"I could not be more proud of them."
Despite Prince Harry regularly speaking out on the issue of climate change, he did not feature in the monarch's speech.
The Queen also used her address to paid tribute to her late husband Prince Philip and his decades-long efforts on raising the profile of climate change, quoting from a speech he gave in 1969.
