Debate - Did deadly space rocks slammed into Northern Canada about 13,000 years ago, triggering a mini-Ice Age?    Did deadly space rocks slammed into Northern Canada about 13,000 years ago, triggering a mini-Ice Age and the eventual extinction of the woolly mammoth and a host of other prehistoric species? Advocates of the theory site the discoveries of nanodiamonds at sites around North America as proof that a cosmic blast sent showers of shocked rock particles across the continent.

Debate - Monorail vs Metro    Building a new mass rapid transit system in an established city is always difficult as it requires lot of existing buildings and trees to be demolished. While, monorails need minimal space, is usually less expensive to build, the tracks cannot be used for any other train service and also difficult to evacuate in an emergency as it is on an elevated track. Should a city use monorail instead of the metro? Given that hundreds of cities have implemented these systems, participants can cite advantages and disadvantages of both the systems with real life examples.

Debate - Should modern buildings be allowed to be built near buildings of historical architectural heritage?    With the ever increasing population and need for more and more office space, we are building into the sky with modern skyscrapers being built all over the world. To preserve the architectural heritage of some of our existing buildings, should we stop building modern skyscrapers near historical monuments and buildings? Or will this create an artificial shortage of houses and office spaces and push the prices out of affordability? Is it an viable option to construct all new building only in sub-urban areas and build sustainable communities around them? Many of the city office workers commute from sub-urban areas already.