Are you claiming the COP21 is a "scientific convocation"? Here's the highlights of the "event"(that's what it's labeled as):

SIF15 Highlights:

    750+ attendees - the largest number of global stakeholders at any commercially-inclusive side event at COP21
    International attendance – decision makers from across the globe represented 43 countries
    Over 80 world class speakers included country Ministers, industry CEOs and international thought-leaders
    Interactive discussion panels were held throughout the event, allowing for in-depth debate via audience Q&A and polls
    Workshops and co-located events took place to maximise content and networking opportunities throughout the two days

http://www.cop21paris.org/

This isn't any more "scientific" then a trade show for IT products or some such. It's a sales event for the elite with lot's for fringe benefits for attending.