Forests cover around 30 % of the Earth’s surface, are home to millions of species, capture and store carbon dioxide (CO2), influence the local climate and provide us with water. This month, Horizon examines how the health of the world’s forests impacts on climate change. We explore the link between deforestation, forest degradation and CO2 emissions, examine the push to combine farming and forestry for better land management, and find out how scientists are using tree rings and DNA to combat illegal logging.
While it seems common sense that planting more trees should help remove carbon dioxide (CO2) from the atmosphere and thereby cool the planet, Europe's forest management strategies have actually not helped to fight climate change, according to Professor Sebastiaan Luyssaert, from Vrije Universiteit Amsterdam, The Netherlands.
Climate change is threatening Europe’s coffee supplies, but the impacts could be diluted by planting the crops amongst trees - a technique known as agroforestry, which is also being revived in European farming.
Dumped waste, from used nappies to industrial by-products, have long wound up in landfills and can take hundreds of years to decay. In October we speak to the scientists figuring out how to keep such items in use to reduce rubbish and create a so-called circular economy. We learn about new efforts to mine industrial waste for the rare metals that go into making aircraft parts, pacemakers and bicycle gears, and find out about the culture shift needed to develop a zero-waste society. We also speak to the researchers building a biorefinery to turn soiled nappies into fertilisers and raw materials, and look at whether seaweed could become the next plastic.
The model of our universe as expanding at an accelerated rate has given rise to theoretical constructs such as dark energy and dark matter, which scientists believe could make up 95% of the universe. In September, Horizon takes a deeper look at what we really know about the expanding universe. We speak to Prof. Subir Sarkar, who believes that the Nobel-winning discovery that universe expansion acceleration could be a fluke, and the scientists who are trying to answer the question by allowing us to better measure the expansion rate. We also look at the significance of accurately measuring gravity in deep space, and what dark matter haloes can tell us about the existence of dark energy.
As wind turbines become increasingly familiar sights along shorelines, developers of offshore floating platforms, which harness the powerful winds further out to sea, are seeking to establish their technologies as a major viable source of clean energy.
Bill Gates and the European Commission have launched a €100 million investment fund designed to bring radical clean energy technologies more quickly to market in order to promote energy efficiency and cut greenhouse gas emissions.
Floating wind turbines could be a clean energy game changer.
Europe's leadership 'more important than ever', says Gates.
A circular economy needs new business models and reusable products, says Felipe Maya.