Convective overshooting over tropical land is key contributor to troposphere-tostratosphere transport, known to inject adiabatically cooled air, trace gases, ice water and tropospheric air, in the lower stratosphere. But unexpectedly, all studies from radio-sondes, GPS Cosmic temperatures, MLS water vapor, ODIN-SMR N2O, HALOE CH4 and CALIPSO aerosols, are showing much more intense convective uplift reaching 20-21 km during the austral summer over southern tropical continents compared to the northern tropics where they are limited to altitudes below the tropopause. The tentative explanation for that is the stronger and faster daytime heating and development of Convective Available Potential Energy (CAPE) in the cleaner southern hemisphere compared to the dirty northern where the larger optical depth is attenuating the solar radiation. Shown in the presentation will be experimental evidence from a variety of observations of the stronger convective vigor in the southern tropics, a tentative explanation of the origin of the CAPE difference and, implications for relationship between pollution and climate.