How might global warming impact terrestrial biomes? how might global warming impact terrestrial biomes? increased boreal forest increased transpiration from plants decreased precipitation longer winter seasons?

Global warming impacts terrestrial biomes since it brings about decreased precipitation and longer winter seasons. Global warming refers to the increase in temperature of the Earth's atmosphere. This is brought about by release of greenhouse gases (e.g. carbon dioxide, methane) in the air which trap heat in the Earth's atmosphere. As a result, there is increased variability of weather and climate patterns.   

I will answer in English.

The weight of the kid is 30kg.

the surface of his sneakers is 150cm^2

and we know that pressure is defined as: P = F/A

where F is force, in this case, F is the weight of the kid, and A is the surface area.

When the kid is using both his legs to stand, the weight is divided equally between both legs, so we have 15kg per leg.

Then the pressure in each foot is:

P = 15kg/150cm^2 = 0.1 kg/cm^2

If he is using only one leg, then all the 30kg are being supported by that leg, then the pressure is:

P = 30kg/150cm^3 = 0.2g/cm^3