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Unless actions by governments and corporations cut emissions in the here and now, a dose of scepticism is in order

So it’s goodbye climate deniers, hello – and you’ll pardon me for being blunt here – climate bullshitters.

The impacts of the climate emergency are now so obvious, only the truly deluded still deny them. Instead, we are at the point where everyone agrees something must be done, but many are making only vague, distant promises of ineffective action. As a result, we are currently on track for a 0.5% cut in global emissions from 2010 levels by 2030, when a 45% drop is needed to avoid climate catastrophe.

Damian Carrington is the Guardian’s environment editor

Charred tree – which may be thousands of years old – looks like chimney spouting smoke in national forest

Scientists have discovered a giant sequoia still smoldering in California’s Sequoia national forest, months after wildfires tore through the region last August.

The tree was found, charred but still standing, by researchers in the lower part of the national forest this week. While turning down a sharp switchback on the trail, a member of Sequoia’s fire ecology and research team spotted a plume of smoke in the ravine below. Using a long camera lens, the team tracked the smoke to a single giant sequoia, standing in the burn area from last year’s Castle fire. The enormous tree, which has probably stood for hundreds if not thousands of years, looked like a chimney spouting smoke in the middle of the blackened forest.

Related: Parts of California see May red flag fire warning for first time since 2014

Despite pandemic-enforced isolation, scientists from around the world have produced a vital climate change forecast

Sea levels are going to rise, no matter what. This is certain. But newresearch I helped produce shows how much we could limit the damage: sea level rise from the melting of ice could be halved this century if we meet the Paris agreement target of keeping global warming to 1.5C.The aim of our research was to provide a coherent picture of the future of the world’s land ice using hundreds of simulations. But now, as I look back on the two years it took us to put the study together, what stands out is the theme of connection running through it all – despite the world being more disconnected than ever.

Connecting digitally: our study brought together 84 people working at 62 institutes in 15 countries (nine in Europe, the US, Canada, Australia, New Zealand, Japan and China). I led the study but haven’t met many of my co-authors. Even if we had planned to meet, over half the 120 days I spent on the study have been since the first UK lockdown. Connecting parts of the world: the world’s land ice is made up of global glaciers in 19 regions, and the Greenland and Antarctic ice sheets at each pole. Our methods allow us to use exactly the same predictions of global warming for each. This may sound obvious, but is actually unusual, perhaps unique at this scale. Each part of the world is simulated separately, by different groups of people, using different climate models to provide the warming levels. We realigned all these predictions to make them consistent.Connecting the data: at its heart, this study is a join-the-dots picture. Our 38 groups of modellers created nearly 900 simulations of glaciers and ice sheets. Each one is a data point about its contribution to future sea level rise. Here, we connected the points with lines, using a statistical method called “emulation”. Imagine clusters of stars in the sky: drawing the constellations allow us to visualise the full picture more easily – not just a few points of light, but each detail of Orion’s torso, limbs, belt and bow.Our process of joining the dots meant we could make a more complete prediction of the full range of possible futures – mapping out our uncertainties in the levels of the rising seas. For instance, if we reduce emissions from current pledges to meet the Paris agreement targets, which would reduce warming from more than 3C to 1.5C, the median predictions for sea level rise from melting ice reduce by half, from 25cm to 13cm, by 2100. For the upper end, there is a 95% chance the level would be less than 28cm if we limit warming to 1.5C, compared with 40cm under current pledges.Connecting to each other: some of the initial conversations for the study were in person. Most memorable and important among them were visiting the ice sheet project lead, Sophie Nowicki, at Nasa to analyse their data in June 2019, and long walks discussing the statistical methods with my mentor and friend Jonty Rougier in Hastings. But even when we went digital, many of us kept a personal, sometimes emotional, connection under the pressures of work and family life amid the pandemic, and with a number of people involved in the research living in California close to the huge wildfires last summer.

Dr Tamsin Edwards is a senior lecturer in physical geography at King’s College London

Campaigners warn offset system is flawed and can produce credits with no climate benefit

Airlines should focus on reducing emissions from flights instead of using carbon offsets for climate commitments, experts and environmental campaigners have warned.

British Airways and easyJet are among several leading carriers that use carbon offsets to back up claims of “carbon-neutral flying” and net zero pledges by buying credits on behalf of passengers or offering customers that opportunity to buy them when booking tickets.