I know this because I’m both a climate researcher and a standup comedian. This means a lot of methane, one of the gases that causes the worst warming. • If you would like a comment on this piece to be considered for inclusion on Weekend magazine’s letters page in print, please email weekend@theguardian.com, including your name and address (not for publication). One cow can produce up to 200kg of methane a year. First, the climate crisis is here to stay, even if we do start to fix it soon. But the negative effect on the climate of Methane is 23 times higher than the effect of CO2. However, the biggest thing that most of us do that contributes to climate change is to assume that what we do does not really matter. There are many ways that we contribute to climate change through our daily activities, often without realising it. I do serious science stuff during the day, but then tell jokes about the climate at night. Climate striking every Friday is a great start. The same is true of emissions. Well, the good news is that nearly all politicians in this country accept that climate change is happening and that it’s caused by human activities; almost all political parties have now accepted that we face a climate emergency. After that, we can bury it permanently, injecting CO2 into rock formations deep underground. This takes courage, it’s true, but I think we find courage in ourselves when we have a great need. • Jeff Goodell, author of The Water Will Come: Rising Seas, Sinking Cities, And The Remaking Of The Civilized World. One cow can produce up to 200kg of methane a year. His podcast, Operation Earth, airs this summer. Find groups of people who already understand the seriousness of climate breakdown, and get involved. A cow does on overage release between 70 and 120 kg of Methane per year. being prepared to take the necessary steps, continuous growth isn’t possible on a planet. For example, the environment secretary, Michael Gove, was championing the expansion of Heathrow airport at exactly the same time as apparently agreeing that there’s a climate crisis – in spite of the fact that air travel is one of the fastest-growing sources of greenhouse gas emissions. Overgrazing those lands can degrade soil health and biodiversity. 4. The good news is, there are a number of great minds working on technological solutions – from renewable energy to electric vehicles – to do just that. 5. My company has developed a technology called direct air capture that removes CO2 using large fans to pull air through a filter that has a liquid capture chemical flowing over it. “Walking the talk” makes you authentic and empowered. However, the bathtub is still full of too much water – the air is already full of CO2 at dangerous levels – and if we cannot turn the tap off completely, the tub is going to overflow. 3. Most of us recognise our moral obligation to leave children a decent future, which obviously includes a decent planet. Do you think of cows and global warming in the same sentence? This means we create something called “negative emissions”; by doing this, we will be able to bring our global emissions down to zero at a much faster rate. One cow can produce up to 200kg of methane a year. That depends on how you think about it. But like sheep and goats, cows are a type of ruminant – that is, they have four stomachs. Most of it is released as burps, but some certainly escapes out of the rear end, too! This is a great question. First, it’s really important to acknowledge the other person’s good nature, and to identify common ground and shared values – areas where you have agreement. There’s always the danger that if we take too long, warming will have increased to the point where melting ice emits methane, creating yet more temperature rises. I’m just annoyed that they didn’t call it the minors’ strike. And humour can be a coping mechanism. Because humans eat so much beef and milk, there are an awful lot of cows in the world, and their burping and farting causes a sizable contribution to our greenhouse gas emissions, making up nearly a third of all emissions from agriculture, by some estimates. • Karen O’Brien, professor at the University of Oslo and co-founder of cchange.no, a website aiming to give people knowledge, skills, and tools to make ethical transformation. Therefore the release of about 100 kg Methane per year for each cow is equivalent to about 2'300 kg CO2 per year. Imagine the tub is the world’s atmosphere, the water is carbon dioxide, and the tap is running. Laughter has a strong social function in bonding groups of people together and also helps make the message more relatable. I think more scientists should try it. If anything, bombarding people with facts makes them more sceptical and argumentative. You are obviously both smart and thoughtful kids, so I will be blunt and tell you that climate change is already causing big changes in our world. But even if we achieve this aim, most people think that there would be at least a 20-year lag time before temperatures start to measurably go down. For example, scientists know that ice sheets have come and gone many times in our planet’s history, driven mostly by slight wobbles in the Earth’s orbit that change the amount of sunlight hitting the planet (other factors, such as the eruption of volcanoes, have also played a role).

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