The deal is the first homepage takeover partnership for Ask Jeeves and was brokered by MPG.
The Team Green Britain takeover tomorrow will coincide with the launch of Green Britain Day, an annual event designed to inspire the nation to work together to take action and lower Britain's carbon footprint.
The initiative is encouraging people to 'do something green for the team' on Green Britain Day.
People are invited to join Team Green Britain (teamgreenbritain.org), a community aimed at harnessing the power of collective action. Developed in association with the Eden Project, the website suggests new actions to take on Green Britain Day.
To mark the occasion, Jeeves will feature a green union flag suit, and the Jeeves Question of the Day feature will relate to making Britain greener.