Are the effects from the Inventrix Corporation and the Special Design card cumulative?
Each offers +2/-2 to the temp/oxy/ocean Requirements -- the Corp card all the time, the Special Design one just for the next project.
But if you have both in play is it +4/-4 for the next project?
Yes, they are cumulative, as can be seen in this thread:
Here's a quote from Jacob Fryxelius:
Jacob Fryxelius wrote:
There are 3 cards with this effect, and they stack.
I still long for the day when I will see Inventrix play Adaptation Technology and Special Design, followed up by Kelp Farming (requires 6 oceans) - on the first generation!