The Guardian

• ‘I’ve never worked with so many conservatives’: the Texans fighting the Big Bend border wall

  Residents across party lines say Trump’s proposed wall threatens their homes, livelihoods and wilderness along the Rio Grande

  Last February, 41-year-old Molly Walker posted an Instagram story: a photo of herself standing in the desert, sunglasses hooked over the front of her shirt, jeans slung low beneath her exposed midriff. She held a protest sign fashioned from a pizza box, a hand-drawn heart framing the words “Border Cultura”, with “NO WALL” scrawled beneath.

  The text over the photo included a call to action: “… if you want to organize, DM me.”

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• Surviving extreme heat increasingly boils down to this: access to air conditioning | Mark Wolfe

  The next great climate divide will be between countries that have the resources to adapt and those that don’t

  This summer, much of the media’s attention has focused on record temperatures across Europe and the United States. Television coverage has been filled with familiar images: heat maps shaded deep red, schools closing, rail lines slowing, wildfires spreading and emergency rooms treating growing numbers of people with heat-related illnesses.

  Public officials have responded with equally familiar advice: stay indoors, drink plenty of water and, if possible, turn on the air conditioning.

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• US trial could reveal who paid hackers to target Exxon climate critics: ‘on the edge of our seats’

  Oil giant has denied involvement, but climate activists are closely watching court case against Israeli private investigator for answers

  A group of American climate activists are closely watching a US court case that could reveal who hired hackers to target their inboxes a decade ago.

  In 2015, a set of explosive media reports revealed that ExxonMobil’s own scientists determined as early as 1982 that the extraction and burning of fossil fuels caused the climate crisis – but Exxon went on to fund climate denial campaigns anyway. The reports prompted attorneys general to investigate the company.

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• California faces highest shark numbers in years as great whites head north

  El Niño climate phenomenon heating waters off Mexico but incidents with humans remain a rarity

  California is set to see one of its sharkiest summers in a decade, with large numbers of juvenile great whites already on a reverse vacation from the warm waters of Mexico to cooler pastures along the western United States.

  The marine predator has become more common along the west coast in recent years, with stories of surfers seeing underwater behemoths closer to shore and scientists saying swimmers and ocean-lovers alike are probably already sharing their favorite beaches with great whites, whether they know it or not.

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• Hello from the outside: heat domes impeding radio and other signals in US midwest

  Higher temperatures can cause radio, TV and microwave signals to travel hundreds of miles farther, upsetting communications

  It was 3am in north-east Indiana’s Huntington county when the outdoor emergency alarm went off on 1 July.

  The only issue? There wasn’t a storm, tornado or any other emergency weather event forecast or present anywhere for hundreds of miles.

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