  We describe how difficult it is to realise baryogenesis in models where the
fundamental scale in nature is as low as TeV. The problem becomes even more
challenging if we assume that there are only {\it two} extra compact spatial
dimensions, because thermal history of such a Universe is strongly constrained
by various cosmological and astrophysical bounds which translate the maximal
temperature of the Universe which must not exceed $\sim {\cal O}(10)$MeV. This
simply reiterates that the observed baryon asymmetry must be synthesised just
above the nucleosynthesis scale. In this talk we address how to construct a
simple model which can overcome this challenge.
