Biological heat dissipation methods If the human body is facing temperatures above it's own temperature in a humid environment eg. a rainy jungle above 37 degree celsius, are there any mechanisms that still allows heat dissipation? 
I guess this conditions may occur from time to time in certain regions, so do humans survive this or are they forced to leave the place in that case?
 A: One way the body uses to lose temperature is by sweating. If the humidity of the environment is high, the the sweat can't vaporize(the environment won't accept it) and thus the water on the body gets warmer and we feel even more awful.
But there are other mechanism by which the body loses energy and thus temperature. One of the main mechanism is via radiation. The body emits all the time EM radiations like it absorbs. We can take that the amount of emitted radiation is: $E_r = \epsilon A \sigma T^4 $, where $0< \epsilon <1 $, $T$ is the temperature of the body(absolute) and A is the surface of the body. We can then approximate the pure loses as this: $H_r = K_r A_r \epsilon (T_{skin} - T_{environment}) $, where $A_r$ is the effective surface of the body, that is the surface that can radiate(imagine you lie down on the floor. Than only the up side can radiate to the environment. ) and $K_r$ is a constant depending on environmental parameters and it's about$2.1 \times 10^4~J(m^2 hour Celsius). Under normal circumstances(not under extreme conditions of the environment or under bad health) a body loses about half of it's energy by emitting radiation.
Another way to lower our temperature is by touch with the air. Again there is a relationship(empirical) that states: $H_c = K_c A_c (T_s - T_{air}) $, where the quantities have analogous meaning with before. $K_c$ is a function of air velocity.
We also lose about 14% of heat from our body just because we breath.
Another way also to lose heat is from the veins. When the environment is colder than us the body's reaction is to change the road from where the blood goes to the heart via internal veins that are in contact with the arteries that send the blood to it's edges. When the temp is higher then the blood at the edges of the body runs close to the skin so that more heat can be lost. 
Hope this helps.
