Bio fuels - Are they good?

As the term suggests, bio-fuels are fuels that are formed when biological matter decomposes. The bio-fuels are mostly derived from plants. Bio-fuels exist in all the three states of matter: solid, liquid, and gas.

Difference between bio-fuels and fossil fuels
Bio-fuels are different from fossil fuels in the following ways:
• Fossil fuels take a million years to build whereas bio-fuels can be made extremely fast, in a matter of days.
• Fossil fuels generate huge amounts of pollution. Bio-fuels are comparatively safer.
• Bio-fuels are renewable sources of energy unlike fossil fuels.

Different types of bio-fuels
Bio-fuels have been categorized into four types: first generation, second generation, third generation, and fourth generation.

The first generation bio-fuels are derived from vegetable fats, starch, and sugar, which are in turn derived from food-crops. The first generation fuels are also derived from animal fats. Biogas, bio-diesel, and vegetable oil are some examples of this type of bio-fuels.

The second generation of bio-fuels is mainly derived from waste biomass, thus making it a more balanced option compared to the first-generation bio-fuels. Different kinds of alcohols and diesel generated from wood fall into the category of second generation bio-fuels.

The third generation comprises of bio-fuels derived from algae. Algae are farmed on large scales for creating these bio-fuels. The algae fuels are extremely environment-friendly as they can easily decompose into the soil without harming it.

The bio-fuels in the fourth generation are derived by a method in which micro-organisms are raised to work with carbon dioxide to generate fuel.

Advantages of bio-fuels
Bio-fuels prove advantageous in the following ways:
• Bio-fuels lessen the burden on gradually-vanishing fossil fuels.
• Bio-fuels are environment-friendly. They help reduce carbon emissions into the atmosphere.
• Bio-fuels, especially, bio-diesel prove to be very cost-effective for consumers.

Disadvantages of bio-fuels
Bio-fuels are not bereft of criticism. Though beneficial for the environment, bio-fuels have its disadvantages, paradoxically in the environmental purview. Bio-fuels have received criticism for many reasons, a couple of which are stated below:
• Economists have long debated on the usefulness of first generation bio-fuels when compared to the lack of food they cause. Generating fuel from food crops makes food crops unworthy of human consumption. Some people believe that being a higher priority than fuel, food should not be farmed for making fuels but for human consumption.
• Making bio-fuels require acres of farming land, thus encroaching upon the natural habitat of plants and animals.

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Full Articles: GRIP, FOOTWORK, AND STROKES IN TENNIS. Footwork is weight control. It is correct body position for strokes, and out of it all strokes should grow. In explaining the various forms of stroke and footwork I am writing as a right-hand player. Left-handers should simply reverse the feet. Racquet grip is a very essential part of stroke, because a faulty grip will ruin the finest serving. It is a natural grip for a top forehand drive. It is inherently weak for the backhand, as the only natural shot is a chop stroke. To acquire the forehand grip, hold the racquet with the edge of the frame towards the ground and the face perpendicular, the handle towards the body, and "shake hands" with it, just as if you were greeting a friend. The handle settled comfortably and naturally into the hand, the line of the arm, hand, and racquet are one. The swing brings the racquet head on a line with the arm, and the whole racquet is merely an extension of it. The backhand grip is a quarter circle turn of hand on the handle, bringing the hand on top of the handle and the knuckles directly up. The shot travels ACROSS the wrist. This is the best basis for a grip. I do not advocate learning this grip exactly, but model your natural grip as closely as possible on these lines without sacrificing your own comfort or individuality. Having once settled the racquet in the hand, the next question is the position of the body and the order of developing strokes. All tennis strokes, should be made with the body' at right angles to the net, with the shoulders lined up parallel to the line of flight of the ball. The weight should always travel forward. It should pass from the back foot to the front foot at the moment of striking the ball. Never allow the weight to be going away from the stroke. It is weight that determines the "pace" of a stroke; swing that, decides the "speed." Let me explain the definitions of "speed" and "pace." "Speed" is the actual rate with which a ball travels through the air. "Pace" is the momentum with which it comes off the ground. Pace is weight. It is the "sting" the ball carries when it comes off the ground, giving the inexperienced or unsuspecting player a shock of force which the stroke in no way showed. A great many players have both "speed" and "pace." Some shots may carry both. The order of learning strokes should be: 1. The Drive. Fore and backhand. This is the foundation of all tennis, for you cannot build up a net attack unless you have the ground stroke to open the way. Nor can you meet a net attack successfully unless you can drive, as that is the only successful passing shot. 2. The Service. 3. The Volley and Overhead Smash. 4. The Chop or Half Volley and other incidental and ornamental strokes.

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