Actually, they don't. Are you talking about reducing pollution?
how can building codes and guidelines help reducing arhitectural disasters
Trees in the forest act as wind-breaks, and their roots help slow the effects or erosion.
The roots of forest's and trees help hold back the soil and debris, therefore stopping the erosion.
Gravity keeps trees from floating about.
friction
I never heard of friction reducing friction. You can reduce friction by using lubricants, as well as using wheels (as in ball bearings).
Lubrication will help in reducing friction in a very smooth manner. It is a process that prevents solid to solid contact which would cause friction. You would need to use a lubricant such as oil or water for lubrication.
no
they give out oxygen during photosynthesis.
no
by reducing the mass you reduce the friction, and by reducing the friction reduce the fuel needed to move the car, this applies to all cars not only CO2 cars.
Yes, they do. I shall explain: The trees are able to do this by making the wheels on the bus reach their maximum revolution-rate and therefore go round and round. So. The friction of the road, or say the palm of your hand against your best friend's back, will increase unless trees exist in your back garden. So, that is in short why trees help reduce friction.
One way to reduce friction is to use a lubricant.
Efficiency Efficiency
Inceases its efficiency.
TO REDUCE FRICTION: We can use fine powder on the carrom board to reduce friction
A lubricantis a substance introduced to reduce friction between moving surfaces. It may also have the function of transporting foreign particles. The property of reducing friction is known as Lubricity. (Slipperiness) This causes less friction.