Identifying that you need a new boiler is one thing, understanding what boiler is best for you is another. So the pals from cast iron radiators 4u take you through the different types of boiler available, what to consider when deciding on which size of boiler to buy and how much it would cost to purchase and install a new combi-boiler.
The World Day to Combat Desertification (WDCD) is observed worldwide on 17 June every year. The focus this year is “attainment of food security for all through sustainable food systems.”
With the slogan, ‘No such thing as a free lunch. Invest in healthy soil’, the 2015 observance calls for
- A change in our land use practices through smart agriculture and adaptation to changing climate, especially in the dry fragile parts of the world where food shortages are becoming more and more severe
- Access to technology and land rights for small holder farmers who safeguard the environment and meet the food needs of millions of households, especially among the poorest households
- A balance in the land use for ecology and consumption, drawing on the best practices
- More investments in sustainable land practices so that sustainable food systems become the normal practice and
- More effective action on desertification whose effects on security, peace and stability are invisible yet real for the affected countries due especially to food and water scarcity and environmentally forced migration.
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When most people think of gardening, soil comes to mind. But plants don’t actually require it to survive. They mostly need the nutrients and minerals in the soil. Plants can grow in water, gravel, perlite, rice hulls, pine bark, cedar shavings, and other mediums, or even suspended in air.
The science of soilless gardening is called hydroponics. It may sound like something devised in a modern laboratory, but it’s been around for thousands of years. The essential ingredient is an oxygenated mineral-nutrient solution that’s circulated through plants’ roots.
Some scholars theorize the ancient Hanging Gardens of Babylon, one of the Seven Wonders of the World, was a hydroponic system. The Aztecs grew maize, squash, beans, amaranth, tomatoes, chili peppers, and flowers in high-output chinampas, or floating gardens, which were hydroponic systems. A traditional hydroponics system is still in use on Myanmar’s Inle Lake, and similar systems probably existed in ancient India, Greece, China, and Egypt.
In the early 1600s, the British scientist Sir Francis Bacon, father of the scientific method, conducted formal research on hydroponics, which he called “water culture.” Laboratory experiments continued into the 20th century. In 1937, William F. Gericke applied the experiments to large-scale commercial applications, and the modern hydroponics movement was born.
Today many people identify hydroponics with marijuana growers, who’ve made use of the technology. But much of the world’s greenhouse produce is now grown in hydroponics systems, including some of the lettuce, tomatoes, herbs, and veggies in many supermarkets’ refrigerated cases.
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Humanity is sitting on a time bomb. If the vast majority of the world’s scientists are right, we have just ten years to avert a major catastrophe that could send our entire planet’s climate system into a tail-spin of epic destruction involving extreme weather, floods, droughts, epidemics and killer heat waves beyond anything we have ever experienced- a catastrophe of our own making. Continue reading “Green Documentaries: An Inconvenient Truth”