With Our rivers, we want to dig deeper into the effects our changing climate. Drought is already hitting river systems such as the Amazon and La Plata in Latin America, but there are also challenges from the new timetables of our melting glaciers, and shifting rain patterns. The Ganges and the Brahmaputra in India have both suffered from the changes to the annual monsoon season.
Even the mighty Congo River in Africa, the world’s deepest river (it crosses the equator twice!) has been hit by the climate crisis, drying up, slowly, for the last few decades, due to less rain, a weakening of the Walker circulation and an increase in sea surface temperature in the central eastern tropical atlantic ocean.
But we also want to explore other human impacts. Most of our rivers are now heavily engineered from their source to their outflow into the sea. Political battles are being fought over how that water should be distributed, both between neighbouring states in the case of the Colorado and, in some cases, between countries, such as Egypt and Ethiopia, which have only recently settled a long diplomatic standoff over the division of the Nile.
In some cases, such as the Mississippi River system, our rivers have arguably been over-engineered, with authorities zigzagging over ways to remedy problems they created; the mouth of the river was dug out to improve access but residents are now struggling to cope with the incursion of the ocean.
We’ve put our rivers under tight control but now, in many places, local authorities are seeking to free them up again. China has put huge amounts of money into rebuilding the Yangtze, and is seeing the results: the doubling of fish biomass and rebounding of endangered species shows that the government measures are starting to work, according to biologists.
The problem of pollution and sewage is a familiar one, but does not become less enraging with familiarity. Over the years, including in Down to Earth, we have reported on huge amounts of sewage being dumped into UK rivers and, in some places, local communities are now stepping in to try to take back control, in a way that central government seems, so far, unwilling to do. But the UK is not the only country that has poisoned its rivers; the Reconquista River in in Buenos Aires is Argentina’s second most contaminated river (after the Riachuelo). Scientists have recently created an “organic” solution for the pollution and our reporters have gone there this week to speak to communities around the river about the way forward.
Over the next year we’ll explore these stories with this project, and look at our sense of ownership of our rivers, the love and passion that people feel for them. We always want to hear from our readers across the globe, so please do let us know what you think by replying to this email or getting in touch on downtoearth@theguardian.com.
One of the streams of the Reconquista River, Buenos Aires province, Argentina. Photograph: Anita Pouchard Serra/The Guardian
