b]F1 hybrid broccoli
b] tokamak devices, containing plasma in a magnetic bottle.
b] Himalayan balsam - no legal issues
When the Arctic ice melts it will produce
c] fresh water, which will mix with the sea water and make it less dense
and perhaps prevent the cold diluted sea water from sinking, and which
may cause problems to the ocean currents, like interfering with the gulf
WHY do you get frost on clear nights, but not if it is cloudy?
c] Because the clouds reflect back some of the heat radiated [lost] by
leads to radiation, and trapping/reflection
of radiation and green house effect.
146: Take extra care at junctions. You should
* watch out for cyclists, motorcyclists and pedestrians as they are not
always easy to see
* watch out for pedestrians crossing a road into which you are turning.
If they have started to cross they have priority, so give way
in 1930's. Dodo around 1700, the great auk 1844
Recycling aluminium cans saves energy. How many recycled cans can be made
with the energy needed to produce one can using virgin ore.
These estimates confirm that
recycling and re-melting aluminium scrap saves 95% of the energy and greenhouse
gas emissions associated with primary aluminium ingot production.
The recycling of Aluminium
uses 95 percent less energy than the production of primary metal from
ENERGY consumed by a car in town compared to the energy consumed by a
cyclist covering the same distance is approximately
The extent to which walking and cycling are more sustainable than motorised
transport in energy terms is set out at figure 1.1. Cycling is the most
mode of transport generally available, and is an order of magnitude
more efficient than motorised travel. Unlike other transport modes, cycling
uses renewable energy. CO2 emissions, which are the main contributor to
global warming, are closely linked to energy consumption.
Energy consumption per person
Bicycle 4 mph
Bicycle 10 mph
Bicycle 15 mph
Walk 4 mph
Car with two
Energy consumption of
cycling, walking and
Source: "Bicycling Science",
Whitt & Wilson, 2nd edition
reprinted 1995, Massachusetts
Institute of Technology Press
Transport Mode Number of people carried Energy use (MJ) per passenger
mile Large car (in town) 1.5 6.8
Large car (open road) 1.5 3.9
Small car (in town) 1.5 3.8
Small car (open road) 1.5 2.7
Train (Intercity) 50% full 2.1
Train (commuter) 65% full 0.9
Bus 50% full 1.0
Motorcycle 1 4.3
Walking 1 0.4
Cycling 1 0.1
Energy consumption of different modes of transport. (Source: Transport
TWO 50-watt bulbs produce the same amount of light as one 100-watt bulb.
A 100-watt bulb produces more
light than two 50-watt bulbs (approximately the same amount of light as
two 60-watt bulbs). You can conserve energy by using less lights with
higher wattage while receiving the same amount of light. Better still
use energy efficient light bulbs
Perhaps because there is the
opportunity for more total heat to be conducted / convected away from
the two filaments than a single one. If the filaments are operating at
the same temperature, ie are at the same colour, then the ratio of light
to total heat they radiate should be the same. [look up black body radiation
- part of the theory behind the green house effect.]
Or perhaps the 100W lamp operates
at a higher temperature, normally around 2700k, than lower wattage lamps.
At a lower temperature the lamp radiates a lower proportion of visible
light and the rest is radiated as infrared ie heat. So a bulb on a dimmer
as it is turned down not only becomes dimmer, but the colour shifts towards
4 x 25 does not equal 100
If you're shopping for a new fixture, remember that a fixture with one
bulb gives you more light than a similar one with several bulbs that add
up to the same total wattage. So for example, one 100W bulb gives off
1 1/2 times as much light as four 25W bulbs. And you only have one bulb
The number one cause of tropical deforestation worldwide is:
c] Clearing of lands for agricultural use is by far the leading cause
tropical deforestation worldwide. In some areas ie Sumatra, commercial
logging is approved in order to clear land for agriculture, but the logging
is more profitable and the ground is left wasted.
What is the goal of the Kyoto Treaty signed in 1997?
Reversal of global warming. The Kyoto treaty establishes a protocol through
which industrial countries would cut carbon dioxide and other greenhouse
gas emissions by an average 5.2 percent below 1990 levels by 2012.
13 What is the most common
reason that an animal species becomes extinct? Is it because...
b. Their habitats are being destroyed by humans
Which one of these are you most likely to come across in the wild in West
e] Stag beetle
15 Ozone forms a protective layer in the earth's upper atmosphere. What
does ozone protect us from?
d] Harmful, cancer-causing sunlight?
The population of the world is currently about:
b] 6.5 billion
The current world population is slightly less than 6.5 billion (b).