riding your bike obviously - the effect is maximized if the rider in question bikes off a cliff so that his remains can decompose and be used by plants for minerals and other useful stuff.
which came second, the chicken or the egg?
Nope! The bus. It's already running anyway, and won't not run just because you don't ride it. However, you'll exhale more CO
2 if you ride you bike rather than the bus.
The wavelength of violet light is different than the wavelength of blue light, and due to the substances that make up our atmosphere, the violet light is let through, but some of the blue light is reflected off of the atmosphere back into our eyes.
Name one way that you can take 1 away from 4 and have 5 as your result.