Scottish brewing giant BrewDog is offering beer fans a free pint of their 'carbon-negative' lager.
Anyone signing up to their online Planet BrewDog loyalty scheme, which offers badge-based rewards and aims to help plant a tree for every multipack of beer sold, will unlock a free pint of Lost Lager.
The 'carbon-negative' beer, which BrewDog is a planet first, is a 4.5% German-style Pilsner brewed using wind power, a third less water, and would-be waste bread in the malt bill.
Those who sign up and claim the beer will also be given a £10 voucher for the Ellon-brewery's online shop.
A post on the brewing firm's website read: "Simply sign up to Planet BrewDog to unlock your free pint. And whether you like it or not we will give you £10 for taking the time to consider our beer.
"Once you've claimed your free pint in one of our UK BrewDog bars, we'll send you a £10 voucher to spend on our online store, which is valid until 21st December."
The firm says anyone signing up for the reward scheme will be able to help reduce carbon emmissions.
It added: "Not only does BrewDog plant a tree for every multipack of beer sold, but we also take twice as much carbon out of the air as we emit. That includes the CO2 from your home delivery. So every time you shop, you’re doing something good for the planet."
The brewing giant recently pledged that it will plant one tree for every multipack of its headliner beers sold in 2021, including purchases of packs of Lost Lager, Punk IPA, Hazy Jane, and Elvis Juice.
The trees will then be planted in partnership with the Eden Project as part of a wider program focused on native tree planting and ecosystem restoration.
The news comes as it revealed that the company had had its wrist slapped by advertising standards over its recent '24 carat gold' can promo.
The brewing firm claimed the cans were worth £15,000.
This was disputed by one winner who said an independent valuer stated they were in fact made from brass and gold plating and worth just £500.
Co-founder James Watt has since claimed he will offer the previous winners £15k of his own money in exchange for the cans.
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