Charcoal is basically all carbon, so can burning it ever be green?
Over 90% of the charcoal we burn on our barbecues comes from non-UK forests, many of which are not replaced when they're cut down. Deforestation has such a significant impact on climate change that barbecuing with non-sustainable charcoal is calculated to emit five times more CO2 than cooking with gas, according to one World Bank study. Luckily there's another way to keep those home fires burning without heating up the climate: British charcoal from sustainable forests.
What difference will it make?
Buying charcoal sourced from sustainable British forests can take a big bite out of your barbecue's emissions.
In sustainable forests, trees are often coppiced rather than cut down, and if they are cut down, they are replaced. Unsustainable charcoal drives deforestation, which currently accounts for a staggering one-fifth of all manmade CO2 emissions.
Making the switch to sustainable charcoal reduces your emissions by exactly as much as replacing disposable nappies with reuseable varieties, shaving 24kg to 95kg of CO2 a year off the average Brit's carbon footprint. Of course, if barbecues are a more regular feature in your back garden then the potential carbon savings from switching are much larger.
According to one study by the University of California on charcoal production, sustainably coppicing wood to make charcoal rather than replacing the forest with crops could cut carbon emissions by 2.5 tonnes per tonne of charcoal. It also found that coppicing a fast-growing species of tree (in this case eucalyptus) could actually remove 136 tonnes of carbon per hectare of managed forest. (The study was conducted in Kenya, but the principles are the same.)
The process of transporting charcoal to Britain also racks up a fair amount of emissions. One sustainable charcoal company estimates that shifting a single bag of charcoal from South Africa to a shop in Britain emits ten times more CO2 - enough to power a 100W incandescent light bulb for over three hours - than delivering a home-grown bag.
But there's more to being green than just reducing your carbon footprint. Buying British charcoal increases Britain's biodiversity because it leads to reforestation. In fact, estimates suggest that the UK could meet 50% of English Nature's biodiversity targets simply by becoming self-sufficient.
"What about my lungs?"
Propane (gas barbecue fuel) burns very cleanly, unlike charcoal which directly impacts the quality of the surrounding air. Charcoal barbecues release mercury into the atmosphere, according to new research published in the Journal of Hazardous Materials, 2008. They also emit particulate matter, a danger to human health, but a boon for the climate thanks to its role in the climate-cooling phenomenon known as global dimming.
"I don't care about the climate. What about taste?"
A divisive topic. Some say that there’s no substitute for the smoky flavours imparted by charcoal barbecues. On the other hand, 'non-smokers' might declare that gas barbecues allow you to "taste the meat, not the heat". But even gas barbecues feel the heat from critics, because they provide a 'wet' heat that alters the texture of food.
How do I do it?
Buy sustainable British lumpwood charcoal rather than charcoal briquettes. Charcoal briquettes are more energy-intensive to produce and require lighter fluids because they are much more dense
Replace petroleum-based lighter fluids with waste newspaper and garden waste.
Make your own 'mobile barbecue' rather than buying a disposable one. Load a metal biscuit tin with sustainable charcoal and top it off with metal mesh. Or you can build a permanent barbecue in your garden - just stack some bricks and add a metal grill on top
Try crafting a clay oven. They're quite niche, but emit far less CO2 than charcoal barbecues because they avoid the energy-intensive process of making charcoal. (Charcoal users consume six times more wood than if they’d just used the wood directly).
Cooking tips:
Grill less meat and eat more local, seasonal vegetables
Think twice before you throw another shrimp on the barbie
Marinade your food to reduce cooking time
Wrap your potatoes in foil and cook them in the embers
Add barbecue ash to your compost bin