Breathingearth - CO2, birth & death rates by country, simulated real-time Being vegetarian does more harm to the environment than eating meat By Fiona Macrae for the Daily Mail Updated: 00:26 GMT, 13 February 2010 Switching from British-bred beef and lamb to imported meat substitutes such as tofu increases the need for cultivated land It is a claim that could put a dent in the green credentials of vegetarians: Meat-free diets can be bad for the planet. Environmental activists and vegetarians have long taken pleasure in telling those who enjoy a steak that livestock farming is a major source of harmful greenhouse gases. But research has shown that giving up meat may not be as green as it seems. The Cranfield University study found that switching from British-bred beef and lamb to meat substitutes imported from abroad such as tofu and Quorn would increase the amount of land cultivated, raising the risk of forests being destroyed. Production methods for meat substitutes can be energy intensive and the final products tend to be highly processed, the report, which was commissioned by the environmental group WWF, found.
Catching the Wrong Species This article in NSTA’s December 2014 issue of “The Science Teacher” describes a classroom activity that uses engineering design to help students model modern fishing gear to minimize bycatch in the tuna fishery. (Bycatch is non-targeted marine species typically caught in fishing gear). The lesson uses the 5E instructional model (Engage, Explore, Explain, Elaborate, Evaluate) and outlines a number of techniques to deepen student understanding of the concepts the model represents. The classroom model employs common household items (e.g., different types of beans, marbles, tennis balls, and buckets) to create a model of the ocean. Working in teams, students modify their “fishing gear” prototype at least three times to target more of the species they want to catch and to minimize catching non-target species.
Water In Episode 7 of Ever Wondered? Series 2, Dr John Watt finds out more about water in New Zealand and how computer modelling is used to understand water distribution. He then learns about some new developments in irrigation systems. Understanding water in New Zealand Water is the very life force that powers the planet. Next up, John heads to a Canterbury dairy farm to meet local farmer Craige Mackenzie to find out about the importance of irrigation. To demonstrate the importance of understanding water on a farm, John makes a simple model. Watch Episode 7, Part 1 Computer modelling aids decision-making Computer modelling plays a major role in better understanding just how we are placed when it comes to droughts and floods. So how will climate change affect New Zealand’s water supply? Watch Episode 7, Part 2 Irrigation system innovation Two innovative engineers on top of the water issue are Stu Bradbury and George Ricketts. Watch Episode 7, Part 3 Useful links Activity idea Context links
Predicting Insect Development Using Degree Days | Entomology ENTFACT-123: Predicting Insect Development Using Degree Days | Download PDF by Lee Townsend, Ric Bessin, and Doug Johnson, Extension EntomologistsUniversity of Kentucky College of Agriculture Since insects are cold-blooded animals, temperature plays a major role in their growth and development. There is a threshold temperature for each insect; for example, 48 degrees F for the alfalfa weevil. No development occurs when temperatures are below that level. Insects have an optimum temperature range in which they will grow rapidly. The threshold and maximum temperatures for development of an insect are used to calculate the number of degree days for a specific day. Accumulation of degree day totals usually begins in one of two ways. With integrated pest management (IPM), degree day accumulations are used to predict important events in the life of an insect. The easiest way to calculate degree days for a specific date is to add the daily high and low temperature and divide by two. References
Calculating Degree Days This page explains how Degree Days.net calculates degree days. If you just want heating or cooling degree-day data, there's probably no need to understand the calculation processes in detail - just use our Degree Days.net tool to calculate the degree days for you. But you might find our answers to these calculation-related questions useful if you're curious, or deciding whether to get your degree days from here or another source, or if you're comparing data from our site with data from elsewhere. How do you calculate the degree days? We start with temperature data from Weather Underground. For weather stations that are shown with a bar and stars (see right) - all the "airport" stations and the higher-quality personal weather stations - we use detailed temperature readings taken throughout each day, turning them into degree days using the Integration Method that is explained in this Google Knol about degree days. Why two different calculation methods? It depends on the weather station.
Do cows pollute as much as cars? Agriculture is responsible for an estimated 14 percent of the world's greenhouse gases. A significant portion of these emissions come from methane, which, in terms of its contribution to global warming, is 23 times more powerful than carbon dioxide. The U.S. Food and Agriculture Organization says that agricultural methane output could increase by 60 percent by 2030 [Source: Times Online]. The world's 1.5 billion cows and billions of other grazing animals emit dozens of polluting gases, including lots of methane. Cows emit a massive amount of methane through belching, with a lesser amount through flatulence. To understand why cows produce methane, it's important to know a bit more about how they work. With millions of ruminants in Britain, including 10 million cows, a strong push is underway to curb methane emissions there. Many other efforts are underway to reduce ruminant methane production, such as attempting to breed cows that live longer and have better digestive systems.
Heating & Cooling Degree Days - Free Worldwide Data Calculation Modules & Activies Main Page Using climate science models and NASA satellite images and data sets, students apply problem-solving methods and scientific inquiry skills to address six climate-related scenarios. More Each of the problem-based learning scenarios also includes teacher pages to help educators implement the modules into their classroom teaching. All of the materials are free. Our only request is that teachers register for the site to access the module-specific teacher pages and complete a post-event survey. More Login Whether you’re new to problem-based learning or have extensive experience using this type of instructional approach, we encourage you to view our problem-based learning pages. The Exploring the Environment legacy modules include four variations on problem-based learning—activities, basic, comprehensive, and advanced. Scientists are explorers. Problem-based learning is designed to stimulate discussion within classes, among teachers, with scientists, and across communities.
The Energy Lab | NOVA Labs The world’s energy consumption is predicted to grow by 56% in the next 25 years*. As the demand for energy swells, the stores of fossil fuels we currently depend on are dwindling and becoming more costly to obtain. The burning of these fossil fuels also discharges carbon, which has long-lasting negative effects on the environment. In the Energy Lab, you’ll design a city’s renewable energy system by analyzing the same data as the experts. Design a Renewable Future The Challenge You’ll be presented with energy profiles for five different cities across the United States. Design Depending on a location’s resources, your renewable energy system design may include solar, wind, geothermal, or biomass power. Test your system When you have designed your system, you can test it against yearly historical data. Power up When the test is complete, you’ll power up your renewable energy system and find out if you met your production goals. Videos Are you ready to Design a Renewable Future?