Greenfieldboyce says that there is building up of rocket and capsule for the mission but on the other hand, there is shortage of cash with NASA.
"Are Humans Really Headed to Mars Anytime Soon?" is an article which focuses on the various things which are related with whether people can go to Mars or not.
The different aspects are examined in this article like building up of rocket to hit the planet, or building up of a little capsule. It also takes into consideration the requirement of money to fulfill the mission of going to the planet by NASA.