By blocking every initiative the President and the democratic members of congress put forth, the Republicans are blocking economic growth. They are not doing it for any reason other than they want the President to fail (this has been spoken, out loud, to the press). That is proof right there. It is a stupid policy and needs to be stopped.
The GOP is unwilling to make the investments needed to grow the economy is a smart and equitable way. They are only interested in retaining power for those with high incomes and the corporations who support them. They block nearly all legislation that they dislike instead of compromising, and then they blame the President and the Democrats.
It is really unsettling that in today's political climate, the word "compromise" is seen as a dirty word that neither side will consider until their backs are up against the wall. They keep setting these arbitrary deadlines for deals to be done and then they'll get them done at the last second. Then a few months later there is another deadline that they have difficulty meeting. For what it's worth, I do not think Democrats are much better.
To say 'House Republicans' are threatening growth is to place all the blame on one side. Politics in general constitutes the largest threat. Both Republicans and Democrats seem more interested in proving the other side wrong than in actually solving any problems. I don't think they even care what the 'right thing to do' is, so long as it isn't what the other side says.