This means you can use GeoTools as a library but you cannot
incorporate GeoTools code directly into your GLP application. Legally, the
latter amounts to re-licensing GeoTools under a new license and you do not have
the right to do so.
However the LGPL does allow this - see section 3 of http://www.gnu.org/licenses/lgpl-2.1.html
You may opt to apply the terms of the ordinary GNU General Public License instead of this License to a given copy of the Library. To do this, you must alter all the notices that refer to this License, so that they refer to the ordinary GNU General Public License, version 2, instead of to this License. (If a newer version than version 2 of the ordinary GNU General Public License has appeared, then you can specify that version instead if you wish.) Do not make any other change in these notices.
Once this change is made in a given copy, it is irreversible for that copy, so the ordinary GNU General Public License applies to all subsequent copies and derivative works made from that copy.
This option is useful when you wish to copy part of the code of the Library into a program that is not a library.
So I think we should use wording like:
You can also incorporate GeoTools code directly into your GPL application. Legally, the
latter amounts to re-licensing GeoTools under the GPL, which is specifically allowed
by the LGPL. This re-licensing is one-way, and requires specific actions - see the LGPL.